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 A102372 #14 Sep 08 2022 08:45:16 %S A102372 3,5,6,9,20,24,26,39,42,48,60,65,68,83,84,93,95,108,119,126,132,146, %T A102372 167,179,182,189,203,206,213,224,227,230,233,234,249,258,269,270,272, %U A102372 291,296,305,315,324,329,336,341,345,347,348,363,368,377,384,387,392,402,422,423,438,440,450,455,458 %N A102372 Numbers k such that k11111 is prime. %e A102372 If k=3, then k11111 = 311111 (prime). %e A102372 If k=60, then k11111 = 6011111 (prime). %e A102372 If k=126, then k11111 = 12611111 (prime). %t A102372 Select[Range[500],PrimeQ[100000#+11111]&] (* _Harvey P. Dale_, Jan 15 2013 *) %o A102372 (Magma) [ n: n in [1..700] | IsPrime(Seqint([1,1,1,1,1] cat Intseq(n))) ]; // _Vincenzo Librandi_, Feb 04 2011 %Y A102372 Cf. A101471, A102248, A102249. %K A102372 base,nonn %O A102372 1,1 %A A102372 _Parthasarathy Nambi_, Feb 22 2005