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 A064249 #13 Oct 16 2019 11:28:19 %S A064249 2136,6036,7536,11886,17136,18636,21786,24336,27336,27486,28386,28686, %T A064249 30186,40086,50586,51786,52836,59886,70536,74286,85236,86286,93786, %U A064249 95286,100986,110586,111636,118386,120936,125736,135636 %N A064249 Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,25. %C A064249 am+1, bm+1, cm+1 are primes and am | (N-1), bm | (N-1), cm |(N-1). %D A064249 Harvey Dubner (harvey(AT)dubner.com), personal communication, Jun 27 2001. %H A064249 Amiram Eldar, <a href="/A064249/b064249.txt">Table of n, a(n) for n = 1..10000</a> %t A064249 CarmichaelNbrQ[n_] := ! PrimeQ@ n && Mod[n, CarmichaelLambda@ n] == 1; Select[ Range@ 140000, PrimeQ[# + 1] && PrimeQ[2# + 1] && PrimeQ[25# + 1] && CarmichaelNbrQ[(# + 1)(2# + 1)(25# + 1)] &] (* _Robert G. Wilson v_, Aug 23 2012 *) %Y A064249 Cf. A087788. %K A064249 nonn %O A064249 1,1 %A A064249 _N. J. A. Sloane_, Sep 23 2001 %E A064249 Offset corrected by _Amiram Eldar_, Oct 16 2019