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Residue classes free of values of Euler’s function
 In: Gy}ory K (ed) Proc Number Theory in Progress, pp 805–812. Berlin: W de Gruyter
, 1999
"... Dedicated to Andrzej Schinzel on his sixtieth birthday By a totient we mean a value taken by Euler’s function φ(n). Dence and Pomerance [DP] have established Theorem A. If a residue class contains at least one multiple of 4, then it contains ..."
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Dedicated to Andrzej Schinzel on his sixtieth birthday By a totient we mean a value taken by Euler’s function φ(n). Dence and Pomerance [DP] have established Theorem A. If a residue class contains at least one multiple of 4, then it contains