This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A064245 #12 Oct 16 2019 08:43:33 %S A064245 228,3186,5226,5430,8286,13998,15936,16650,19608,24708,27258,31848, %T A064245 34500,40926,41130,43986,44496,50310,53880,55410,55818,70098,71118, %U A064245 73770,86010,87540,108246,110898,120996,124566,129360,147516,166080 %N A064245 Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,17. %C A064245 am+1, bm+1, cm+1 are primes and am | (N-1), bm | (N-1), cm |(N-1). %D A064245 Harvey Dubner (harvey(AT)dubner.com), personal communication, Jun 27 2001. %H A064245 Amiram Eldar, <a href="/A064245/b064245.txt">Table of n, a(n) for n = 1..10000</a> %t A064245 CarmichaelNbrQ[n_] := ! PrimeQ@ n && Mod[n, CarmichaelLambda@ n] == 1; Select[ Range@ 170000, PrimeQ[# + 1] && PrimeQ[2# + 1] && PrimeQ[17# + 1] && CarmichaelNbrQ[(# + 1)(2# + 1)(17# + 1)] &] (* _Robert G. Wilson v_, Aug 23 2012 *) %Y A064245 Cf. A087788. %K A064245 nonn %O A064245 1,1 %A A064245 _N. J. A. Sloane_, Sep 23 2001 %E A064245 Offset corrected by _Amiram Eldar_, Oct 16 2019