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 A100209 #5 Mar 30 2012 18:50:48 %S A100209 5,13,73,89,41,97,181,149,193,313,569,521,157,397,557,421,709,773,613, %T A100209 853,1429,1741,1097,881,1201,1801,1901,1117,1597,2677,3121,2689,1873, %U A100209 2153,2393,1753,3229,3461,2897,3617,3797,4517,3697,5521,5669,3469,4729 %N A100209 a(n) = A100208(n)^2 + A100208(n+1)^2. %C A100209 Pythagorean primes: A079260(a(n)) = 1, see A100210; %C A100209 a(n) = A073658(n) + A073658(n+1). %H A100209 T. D. Noe, <a href="/A100209/b100209.txt">Table of n, a(n) for n = 1..1000</a> %Y A100209 Cf. A002144. %K A100209 nonn %O A100209 1,1 %A A100209 _Reinhard Zumkeller_, Nov 08 2004