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 A064246 #14 Oct 16 2019 11:28:09 %S A064246 7950,8520,9318,25620,29268,29610,32118,44088,48078,67800,70308,72018, %T A064246 83760,95730,133350,138138,174048,175758,176898,186018,188868,225918, %U A064246 244158,256698,265818,280638,289758 %N A064246 Numbers m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,19. %C A064246 am+1, bm+1, cm+1 are primes and am | (N-1), bm | (N-1), cm |(N-1). %D A064246 Harvey Dubner (harvey(AT)dubner.com), personal communication, Jun 27 2001. %H A064246 Amiram Eldar, <a href="/A064246/b064246.txt">Table of n, a(n) for n = 1..10000</a> %t A064246 CarmichaelNbrQ[n_] := ! PrimeQ@ n && Mod[n, CarmichaelLambda@ n] == 1; Select[ Range@ 300000, PrimeQ[# + 1] && PrimeQ[2# + 1] && PrimeQ[19# + 1] && CarmichaelNbrQ[(# + 1)(2# + 1)(19# + 1)] &] (* _Robert G. Wilson v_, Aug 23 2012 *) %Y A064246 Cf. A087788. %K A064246 nonn %O A064246 1,1 %A A064246 _N. J. A. Sloane_, Sep 23 2001 %E A064246 Offset corrected by _Amiram Eldar_, Oct 16 2019