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%I #18 Aug 29 2021 01:54:58
%S 1,3,5,9,15,21,25,27,39,45,55,63,75,81,105,117,125,135,147,155,165,
%T 171,189,195,205,225,243,273,275,315,333,351,375,405,441,465,495,507,
%U 513,525,567,585,605,609,615,625,657,675,729,735,775,819,825,855,903
%N Positive integers k that divide 16^k - 1.
%C Also, positive integers k that divide A014931(k).
%o (Python)
%o A014957_list = [n for n in range(1,10**6) if n == 1 or pow(16,n,n) == 1] # _Chai Wah Wu_, Mar 25 2021
%Y Cf. A067945, A014945, A067946, A014946, A067947, A014949, A068382, A014950, A068383, A014951, A116621, A014956, A177805, A177807, A128358, A128360
%Y Cf. A128396, A177916
%K nonn
%O 1,2
%A _Olivier Gérard_
%E Edited by _Max Alekseyev_, Sep 10 2011
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