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 A117755 #23 Jun 07 2025 05:21:54 %S A117755 0,9,25,2025,13225,1974025,4862025,6943225,60415182025,207612366025, %T A117755 916408817340025,9960302475729225,153668543313582025, %U A117755 1978088677245614025,13876266042653742025,20761288044852366025,47285734107144405625,406066810454367265225 %N A117755 Squares which remain squares when each digit is replaced by the next digit. %C A117755 Replace 1 with 2, 2 with 3, ..., 8 with 9 and 9 with 0. %H A117755 Max Alekseyev, <a href="/A117755/b117755.txt">Table of n, a(n) for n = 1..22</a> %e A117755 13225 is in the sequence because (1) it is a square and (2) if we transform it we get 24336 and this is also a square. %t A117755 Select[Range[0, 500000]^2, IntegerQ[Sqrt[FromDigits[(1 + IntegerDigits[ # ]) /. 10-> 0]]] &] (* _Harvey P. Dale_, Jan 21 2007 *) %Y A117755 Cf. A048379, A061843, A061844, A127856. %K A117755 base,nonn %O A117755 1,2 %A A117755 Luc Stevens (lms022(AT)yahoo.com), Apr 14 2006 %E A117755 More terms from _Harvey P. Dale_, Jan 21 2007 %E A117755 3 more terms from _Donovan Johnson_, Apr 03 2008 %E A117755 a(14)-a(21) from _Max Alekseyev_, Oct 22 2008 %E A117755 a(1) = 0 prepended by _Max Alekseyev_, Jul 26 2023