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 A057180 #40 Jun 03 2025 17:22:31 %S A057180 7,53,503,1229,22637,1091401,1385203,1522841,2307467 %N A057180 Numbers k such that (14^k + 1)/15 is a prime. %H A057180 Paul Bourdelais, <a href="https://listserv.nodak.edu/cgi-bin/wa.exe?A2=NMBRTHRY;417ab0d6.0906">A Generalized Repunit Conjecture</a> %H A057180 J. Brillhart et al., <a href="http://dx.doi.org/10.1090/conm/022">Factorizations of b^n +- 1</a>, Contemporary Mathematics, Vol. 22, Amer. Math. Soc., Providence, RI, 3rd edition, 2002. %H A057180 H. Dubner and T. Granlund, <a href="http://www.cs.uwaterloo.ca/journals/JIS/VOL3/DUBNER/dubner.html">Primes of the Form (b^n+1)/(b+1)</a>, J. Integer Sequences, 3 (2000), #P00.2.7. %H A057180 H. Lifchitz, <a href="http://www.primenumbers.net/Henri/us/MersFermus.htm">Mersenne and Fermat primes field</a> %o A057180 (Prime95) PRP=1,14,1091401,1,0,0,"15" %K A057180 nonn,more %O A057180 1,1 %A A057180 _N. J. A. Sloane_, Sep 15 2000 %E A057180 a(5) from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 05 2008 %E A057180 a(6) from _Paul Bourdelais_, Mar 10 2014 %E A057180 a(7) from _Paul Bourdelais_, Feb 08 2022 %E A057180 a(8) from _Paul Bourdelais_, Feb 18 2025 %E A057180 a(9) from _Paul Bourdelais_, Jun 03 2025