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 A091314 #18 Jul 26 2013 15:42:01 %S A091314 41,941,196169144121100816449362516941 %N A091314 Primes in A038397 (concatenate first n squares in reverse order). %C A091314 Among the first 51 terms only three terms are prime: SmBackConSq(2), SmBackConSq(3), SmBackConSq(14), found by Micha Fleuren. %C A091314 The next term a(4) is formed from concatenation of square of numbers from 700 to 1 and consists of 3742 digits. - _Shyam Sunder Gupta_, Jul 25 2013 %C A091314 Analogously, a(5) is probably the concatenation of squares up to 2818^2, which is a probable prime of 18269 digits, while a(6) > 10^40000. - _Giovanni Resta_, Jul 22 2013 %H A091314 M. Fleuren, <a href="http://www.gallup.unm.edu/~smarandache/SmBackConSq.txt">Smarandache Back Concatenated Squares</a>. %Y A091314 Cf. A038397. %K A091314 nonn,bref,base,less %O A091314 1,1 %A A091314 M. Grete (martha.grete(AT)web.de), Feb 21 2004