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 A082026 #9 Jan 10 2025 04:32:08 %S A082026 5,25,425,16425,13616425,193613616425,181936193613616425, %T A082026 164181936181936193613616425, %U A082026 13616164181936164181936181936193613616425,19361361361616418193613616164181936164181936181936193613616425 %N A082026 a(1)=5; a(n) is concatenation of squares of digits in a(n-1) (in base 10). %C A082026 If m is a member of the sequence represented by k digits in base 10, all members greater than m are congruent to m mod 10^k. %H A082026 Paolo Xausa, <a href="/A082026/b082026.txt">Table of n, a(n) for n = 1..16</a> %e A082026 The squares of the digits in the third term, 425, are 16, 4 and 25; hence a(4)=16425. %t A082026 NestList[FromDigits[Flatten[IntegerDigits[IntegerDigits[#]^2]]] &, 5, 10] (* _Paolo Xausa_, Jan 10 2025 *) %Y A082026 Cf. A061588. %K A082026 base,easy,nonn %O A082026 1,1 %A A082026 _Matthew Vandermast_, Apr 01 2003