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 A064242 #13 Oct 16 2019 11:27:58 %S A064242 378,576,1236,3018,7506,9090,18396,26250,27966,28098,28428,31068, %T A064242 32190,32586,34500,35490,40506,42156,46446,47700,48888,50670,53376, %U A064242 55290,55818,58788,65256,65718,68226,73308,74760,75618,77730,86178 %N A064242 Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,11. %C A064242 am+1, bm+1, cm+1 are primes and am | (N-1), bm | (N-1), cm |(N-1). %D A064242 Harvey Dubner (harvey(AT)dubner.com), personal communication, Jun 27 2001. %H A064242 Amiram Eldar, <a href="/A064242/b064242.txt">Table of n, a(n) for n = 1..10000</a> %t A064242 CarmichaelNbrQ[n_] := ! PrimeQ@ n && Mod[n, CarmichaelLambda@ n] == 1; Select[ Range@ 88000, PrimeQ[# + 1] && PrimeQ[2# + 1] && PrimeQ[11# + 1] && CarmichaelNbrQ[(# + 1)(2# + 1)(11# + 1)] &] (* _Robert G. Wilson v_, Aug 23 2012 *) %Y A064242 Cf. A087788. %K A064242 nonn %O A064242 1,1 %A A064242 _N. J. A. Sloane_, Sep 23 2001 %E A064242 Offset corrected by _Amiram Eldar_, Oct 16 2019