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 A224848 #16 Jan 16 2023 12:44:06 %S A224848 2,3,14,700,2818 %N A224848 Reverse concatenation of the square of first a(n) integers gives a prime. %C A224848 The number corresponding to a(5) = 2818 is a probable prime of 18269 digits. - _Giovanni Resta_, Jul 25 2013 %e A224848 a(4) = 700 because reverse concatenation of squares of 1 to 700 gives 490000488601......2516941 which is a 3742-digit prime number. %Y A224848 Cf. A091314. %K A224848 nonn,hard,more,base %O A224848 1,1 %A A224848 _Shyam Sunder Gupta_, Jul 22 2013 %E A224848 a(5) from _Giovanni Resta_, Jul 25 2013