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 A369769 #19 Feb 17 2024 11:27:57 %S A369769 5,25,115,125,551,625,2551,2885,3049,3125,15575,15625,72115,78125, %T A369769 303551,390625,1461799,1790635,1802885,1847551,1857449,1946801, %U A369769 1952875,1953125,8053505,8468945,9734425,9765625,36631645,43890449,45072115,48828125,215049449,215418199 %N A369769 Numbers X such that X^2 + Y^2 = 5^(2*k) + 1 and X > Y > 0 and k is the quintal digit length of X-1. %C A369769 The number of terms for a given k is A025435(5^(2*k)+1). %H A369769 A.H.M. Smeets, <a href="/A369769/b369769.txt">Table of n, a(n) for n = 1..116</a> %Y A369769 Cf. A025435. %Y A369769 Cf. A369703 (base 2), A369768 (base 3), this sequence (base 5), A368418 (base 10). %K A369769 nonn,base %O A369769 1,1 %A A369769 _A.H.M. Smeets_, Jan 31 2024