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 A002647 M4900 N2100 #19 Oct 18 2023 10:04:08 %S A002647 13,61,73,193,241,541,601,1021,1801,1873,1933,2221,3121,3361,4993, %T A002647 5521,6481,8461,9181,9901,10993,11113,12241,12541,13633,14173,17761, %U A002647 20593,21433,21661,21841,23773,26113,27901,28393,29101,34141,41161,49201 %N A002647 Sextan primes: p = (x^6 + y^6)/(x^2 + y^2). %D A002647 A. J. C. Cunningham, Binomial Factorisations, Vols. 1-9, Hodgson, London, 1923-1929; see Vol. 1, pp. 245-259. %D A002647 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence). %D A002647 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A002647 A. J. C. Cunningham, <a href="/A001912/a001912.pdf">Binomial Factorisations</a>, Vols. 1-9, Hodgson, London, 1923-1929. [Annotated scans of a few pages from Volumes 1 and 2] %K A002647 nonn %O A002647 1,1 %A A002647 _N. J. A. Sloane_ %E A002647 More terms from _Klaus Brockhaus_, Jun 03 2009