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 A139361 #10 Jun 25 2012 21:54:50 %S A139361 5,13,73,233,569,929,1429,1861,2897,4337,7877,11717,12641,14321,17137, %T A139361 19417,21017,21841,24481,27617,29537,32537,35117,37277,38921,41801, %U A139361 44701,47149,49613,52189,56809,59513,61613,65173,74293,82013,94109 %N A139361 Primes A080478(n)^2 + A080478(n+1)^2. %C A139361 The construction of A080478 requires that certain numbers "k^2 + a(n-1)^2" be prime - the present sequence lists these primes. - _N. J. A. Sloane_, Jun 24 2012 %C A139361 All primes are of the form 4m+1, corresponding m's 1, 3, 18, 58, 142, 232, 357, 465, 724 in A139362. %H A139361 Zak Seidov, <a href="/A139361/b139361.txt">Table of n, a(n) for n = 1..1000.</a> %Y A139361 Cf. A080478, A139362. %K A139361 nonn %O A139361 1,1 %A A139361 _Zak Seidov_, Apr 15 2008