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%I #12 Jun 06 2021 06:30:56
%S 1,2,4,7,8,14,16,28,32,49,56,64,98,112,128,136,196,224,256,272,343,
%T 392,448,452,512,544,686,784,812,896,904,952,1024,1088,1372,1568,1624,
%U 1792,1808,1904,2048,2176,2312,2401,2744,3136,3164,3248,3584,3616,3808,4096
%N Numbers k such that k divides 15^k - 1.
%C A000420 are the only odd terms of the sequence. - _Robert Israel_, Feb 25 2020
%H Robert Israel, <a href="/A177805/b177805.txt">Table of n, a(n) for n = 1..2500</a>
%p filter:= n -> 15 &^ n - 1 mod n = 0:
%p select(filter, [$1..10000]); # _Robert Israel_, Feb 25 2020
%o (PARI) is(n)=Mod(15,n)^n==1 \\ _Charles R Greathouse IV_, Nov 04 2016
%Y Cf. A000420, A014960, A014956, A014951, A014949, A014946, A014945, A067945, A128358, A128360.
%Y Contains A003591.
%K nonn
%O 1,2
%A _Alexander Adamchuk_, May 17 2010
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