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%I A177820 #6 Jun 06 2021 09:03:36
%S A177820 1,3,7,21,381,903,921,2667,5789,6447,17367,18543,73703,114681,116967,
%T A177820 208443,221109,277221,746781,797349,818769,855141,871347,1459101,
%U A177820 2205609,2354961,5090367,5331669,5692701,6099429,7611387,8710041
%N A177820 Numbers k such that k^3 divides 20^(k^2) + 1.
%Y A177820 Cf. A127263 (k^3 divides 2^(k^2) + 1).
%Y A177820 Cf. A128678, A128679, A128680, A128681, A128682, A128683, A128684, A128685.
%Y A177820 Cf. A177813, A177814, A177816, A177817, A177818, A177819, A177820.
%Y A177820 Cf. A128677 (least k > p such that (k*p)^3 divides (p-1)^(k*p)^2+1, where p = prime(n) > 2).
%K A177820 nonn
%O A177820 1,2
%A A177820 _Alexander Adamchuk_, May 14 2010

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