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 A209663 #22 Mar 16 2023 12:23:17 %S A209663 5,13,19,23,29,43,53,79,109,113,139,149,163,173,179,223,233,239,263, %T A209663 313,349,379,439,443,449,491,503,523,569,613,643,659,673,691,709,733, %U A209663 739,743,769,809,839,859,863,919,929,953,1013,1033,1069,1091,1153,1163 %N A209663 Numbers n with property that n is prime, n+18 is prime and both have equal sum of digits. %C A209663 Supersequence of A066540. %e A209663 613 is in the sequence because 613 is prime, 613+18 = 631 is also prime. Sum_of_digits(613) = 10 and Sum_of_digits(631) = 10. %o A209663 (Magma) [p: p in PrimesUpTo(1200) | IsPrime(p+18) and &+Intseq(p) eq &+Intseq(p+18)]; // _Bruno Berselli_, Mar 13 2012 %Y A209663 Cf. A066540. %K A209663 nonn,base %O A209663 1,1 %A A209663 _Antonio Roldán_, Mar 13 2012