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 A208177 #26 Nov 01 2022 12:22:12 %S A208177 257,641,769,1153,1409,2689,3329,3457,4481,4993,6529,7297,7681,7937, %T A208177 9473,9601,9857,10369,10753,11393,11777,12161,12289,13313,13441,13697, %U A208177 14081,14593,15233,15361,16001,17921,18049,18433,19073,19457,19841,20353,21121,21377 %N A208177 Primes of the form 128*k + 1. %C A208177 Odd primes p such that -1 is a 64th power mod p. - _Eric M. Schmidt_, Mar 27 2014 %H A208177 Reinhard Zumkeller, <a href="/A208177/b208177.txt">Table of n, a(n) for n = 1..10000</a> %F A208177 a(n) ~ 64n log n. - _Charles R Greathouse IV_, Nov 01 2022 %t A208177 Select[128 Range[167] + 1, PrimeQ] %o A208177 (PARI) for(n=1,167,r=128*n+1; if(isprime(r), print1(r", "))); %o A208177 (Magma) [ p: p in PrimesUpTo(22000) | p mod 128 eq 1 ]; %o A208177 (Haskell) %o A208177 a208177 n = a208177_list !! (n-1) %o A208177 a208177_list = filter ((== 1) . a010051) [1,129..] %o A208177 -- _Reinhard Zumkeller_, Mar 06 2012 %Y A208177 Cf. A065091, A002144, A007519, A094407, A133870, A142925, A208178, A076339. %K A208177 nonn,easy %O A208177 1,1 %A A208177 _Bruno Berselli_, Feb 25 2012