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Let rep(n) be the n-th repunit number, sequence gives values of n such that rep(n)==rep(8) (mod n).
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%I #5 Mar 30 2012 18:38:52

%S 1,2,4,5,8,10,14,16,20,22,25,26,32,40,44,50,56,64,74,80,88,100,104,

%T 110,125,128,136,140,152,160,176,182,184,185,200,220,224,232,239,248,

%U 250,256,260,296,308,320,328,344,350,352,376,400,404,416,424,440,472,488

%N Let rep(n) be the n-th repunit number, sequence gives values of n such that rep(n)==rep(8) (mod n).

%Y Cf. A002275.

%K easy,nonn

%O 1,2

%A _Benoit Cloitre_, Mar 05 2002