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 A094178 #16 Jul 28 2017 23:56:22 %S A094178 1,3,4,6,7,9,10,13,15,16,18,21,22,24,25,27,28,31,34,36,37,39,42,43,45, %T A094178 46,48,49,51,55,57,58,60,64,66,67,69,70,72,73,76,78,79,81,84,87,88,91, %U A094178 93,94,97,99,100,102,105,106,108,111,112,114,115,120,121,123,126,127 %N A094178 Numbers n such that 4n+1 is divisible only by primes of form 4m+1 (i.e., by the Pythagorean primes A002144). %C A094178 For the actual numbers 4n+1, see A008846(n). %C A094178 Complement of A124934; A125203(a(n)) = 0; A000290 and A000217 are subsequences. - _Reinhard Zumkeller_, Nov 24 2006 %H A094178 Reinhard Zumkeller, <a href="/A094178/b094178.txt">Table of n, a(n) for n = 1..10000</a> %o A094178 (Haskell) %o A094178 import Data.List (elemIndices) %o A094178 a094178 n = a094178_list !! (n-1) %o A094178 a094178_list = map (+ 1) $ elemIndices 0 a125203_list %o A094178 -- _Reinhard Zumkeller_, Jan 02 2013 %K A094178 nonn %O A094178 1,2 %A A094178 _Lekraj Beedassy_, May 06 2004 %E A094178 More terms from _Ray Chandler_, Jun 20 2004