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 A115696 #5 Mar 30 2012 17:40:35 %S A115696 1,925,1426,6112,9801,140301,251945,578151,2112860,78883630,466005001, %T A115696 52244922262,394240923000,527042773467,706743866647,797657661680, %U A115696 869119510700,1445531162626,3905876132501,5205252778462,63253297234426,135399021815552 %N A115696 Pentagonal numbers (A000326) whose digit reversal is a powerful(1) number (A001694). %e A115696 925 is the 25th pentagonal number and 529=23^2 is powerful. %Y A115696 Cf. A000326, A001694, A115695. %K A115696 nonn,base %O A115696 1,2 %A A115696 _Giovanni Resta_, Jan 31 2006 %E A115696 a(19)-a(22) from _Donovan Johnson_, Jun 29 2011