Contents of Volume 21
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                                Wacław Sierpinski's papers on the theory of numbers Acta Arithmetica 21 (1972), 7-13 DOI: 10.4064/aa-21-1-7-13
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                                Publications of Wacław Sierpiński in the theory of numbers Acta Arithmetica 21 (1972), 15-23 DOI: 10.4064/aa-21-1-15-23
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                                Sur la résolubilité de l'équation $x^2 + y^2 + z^2 = 0$ dans un corps quadratique Acta Arithmetica 21 (1972), 35-43 DOI: 10.4064/aa-21-1-35-43
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                                An application of Minkowski's theorem in the geometry of numbers Acta Arithmetica 21 (1972), 51-53 DOI: 10.4064/aa-21-1-51-53
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                                On some exponential sums related to Kloosterman sums Acta Arithmetica 21 (1972), 65-69 DOI: 10.4064/aa-21-1-65-69
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                                A quadratic field of prime discriminant requiring three generators for its class group, and related theory Acta Arithmetica 21 (1972), 71-87 DOI: 10.4064/aa-21-1-71-87
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                                On the coefficients of the $2^n$-th transformation polynomial for j(ω) Acta Arithmetica 21 (1972), 89-97 DOI: 10.4064/aa-21-1-89-97
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                                On the µ-invariants of cyclotomic fields Acta Arithmetica 21 (1972), 99-101 DOI: 10.4064/aa-21-1-99-101
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                                Two combinatorial problems in group theory Acta Arithmetica 21 (1972), 111-116 DOI: 10.4064/aa-21-1-111-116
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                                A sharpening of the bounds for linear forms in logarithms Acta Arithmetica 21 (1972), 117-129 DOI: 10.4064/aa-21-1-117-129
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                                Permutations with coefficients in a subfield Acta Arithmetica 21 (1972), 131-135 DOI: 10.4064/aa-21-1-131-135
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                                A mean value theorem of Bombieri's type Acta Arithmetica 21 (1972), 137-151 DOI: 10.4064/aa-21-1-137-151
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                                Some modular results on the Euler and Bernoulli polynomials Acta Arithmetica 21 (1972), 173-181 DOI: 10.4064/aa-21-1-173-181
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                                New theorems concerning the diophantine equation $x^2 + D =4y^q$ Acta Arithmetica 21 (1972), 183-191 DOI: 10.4064/aa-21-1-183-191
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                                Further developments in the comparative prime number theory, VII Acta Arithmetica 21 (1972), 193-201 DOI: 10.4064/aa-21-1-193-201
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                                Primes of the type φ(x, y)+A where φ is a quadratic form Acta Arithmetica 21 (1972), 203-234 DOI: 10.4064/aa-21-1-203-234
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                                Ideals not prime to the conductor in quadratic orders Acta Arithmetica 21 (1972), 261-270 DOI: 10.4064/aa-21-1-261-270
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                                Differential rings of meromorphic functions Acta Arithmetica 21 (1972), 271-284 DOI: 10.4064/aa-21-1-271-284
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                                Sur les fonctions q-additives ou q-multiplicatives Acta Arithmetica 21 (1972), 285-298 DOI: 10.4064/aa-21-1-285-298
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                                On the diophantine equation $α(x^n - 1)/(x - 1) = y^m$ Acta Arithmetica 21 (1972), 299-311 DOI: 10.4064/aa-21-1-299-311
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                                Numbers with unique factorization in an algebraic number field Acta Arithmetica 21 (1972), 313-322 DOI: 10.4064/aa-21-1-313-322
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                                Über die Idealklassengruppe des Dirichletschen biquadratischen Zahlenkörpers Acta Arithmetica 21 (1972), 323-327 DOI: 10.4064/aa-21-1-323-327
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                                The distribution of values of the Euler function Acta Arithmetica 21 (1972), 329-345 DOI: 10.4064/aa-21-1-329-345
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                                On some special quartic reciprocity laws Acta Arithmetica 21 (1972), 367-377 DOI: 10.4064/aa-21-1-367-377
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                                On reciprocally weighted partitions Acta Arithmetica 21 (1972), 379-388 DOI: 10.4064/aa-21-1-379-388
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                                Some diophantine equations solvable by identities Acta Arithmetica 21 (1972), 389-390 DOI: 10.4064/aa-21-1-389-390
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                                The representation of real numbers by infinite series of rationals Acta Arithmetica 21 (1972), 391-398 DOI: 10.4064/aa-21-1-391-398
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                                On a linear diophantine problem of Frobenius Acta Arithmetica 21 (1972), 399-408 DOI: 10.4064/aa-21-1-399-408
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                                Remarks on some new applications of the dispersion method Acta Arithmetica 21 (1972), 409-410 DOI: 10.4064/aa-21-1-409-410
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                                A remark on a previous paper by Bredihin and Linnik Acta Arithmetica 21 (1972), 411-412 DOI: 10.4064/aa-21-1-411-412
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                                Additive problems involving squares, cubes and almost primes Acta Arithmetica 21 (1972), 413-422 DOI: 10.4064/aa-21-1-413-422
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                                On the analytic theory of quadratic forms Acta Arithmetica 21 (1972), 423-436 DOI: 10.4064/aa-21-1-423-436