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 A261142 #27 Oct 31 2015 14:11:22 %S A261142 88,248,826,1417,1571,1595,3682,3928,4448,5089,5137,6479,7754,8038, %T A261142 8384,8461,9257,9640,10393,10825,10922,11878,13294,14290,14767,14941, %U A261142 15977,16786,17684,17777,17935,18437,18677,19495,20497,20555,21649,22487,23239,23396 %N A261142 Numbers n such that n, p=prime(n) and q=prime(p) have the same sum of digits. %C A261142 Hence both p and q are Honaker primes (A033548) and both n and p are terms in A033549. %e A261142 n=88, p=prime(n)=457 and q=prime(p)=3229 have the same sum of digits=16; %e A261142 n=248, p=prime(n)=1571 and q=prime(p)=13217 have the same sum of digits=14; %e A261142 n=660349, p=178115131 and q=178115131 have the same sum of digits=28. %Y A261142 Cf. A000040, A000720, A007953, A033548, A033549. %K A261142 nonn,base %O A261142 1,1 %A A261142 _Zak Seidov_, Oct 22 2015