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 A064248 #14 Oct 16 2019 11:28:15 %S A064248 6036,13626,43710,46470,46746,51990,52956,55440,58476,60960,77796, %T A064248 82350,86076,95460,99876,114780,121266,168600,176190,195510,201996, %U A064248 208206,255126,258990,261336,268926,270030,270306 %N A064248 Numbers m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,23. %C A064248 am+1, bm+1, cm+1 are primes and am | (N-1), bm | (N-1), cm |(N-1). %D A064248 Harvey Dubner (harvey(AT)dubner.com), personal communication, Jun 27 2001. %H A064248 Amiram Eldar, <a href="/A064248/b064248.txt">Table of n, a(n) for n = 1..10000</a> %t A064248 CarmichaelNbrQ[n_] := ! PrimeQ@ n && Mod[n, CarmichaelLambda@ n] == 1; Select[ Range@ 280000, PrimeQ[# + 1] && PrimeQ[2# + 1] && PrimeQ[23# + 1] && CarmichaelNbrQ[(# + 1)(2# + 1)(23# + 1)] &] (* _Robert G. Wilson v_, Aug 23 2012 *) %Y A064248 Cf. A087788. %K A064248 nonn %O A064248 1,1 %A A064248 _N. J. A. Sloane_, Sep 23 2001