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 A115095 #28 Jul 23 2025 01:02:34
%S A115095 1,2,11,20,83,149,188,209,326,347,566,944,1301,1565,1574,1607,1805,
%T A115095 1892,1943,2102,2228,2531,3173,3485,4379,5135,5534,6299,6722,6950,
%U A115095 7223,7727,7970,8105,8273,8882,9785,9914,10112,10985,11654,11930,12221,13547
%N A115095 Positions of 4's in A038800 with offset 1.
%C A115095 Starting with a(2)=2, numbers m such that 10*(m-1)+{1,3,7,9} are all primes.
%C A115095 Essentially the same as A064975. - _R. J. Mathar_, Aug 11 2008
%D A115095 4 is the maximum possible number of primes between 10*n and 10*(n+1).
%H A115095 Paolo Xausa, <a href="/A115095/b115095.txt">Table of n, a(n) for n = 1..10000</a>
%F A115095 a(1) = 1; for n >= 2, a(n) = A007811(n-1) + 1. - _Paolo Xausa_, Jul 15 2025
%e A115095 11 is a term because 10*(11-1)+{1,3,7,9} = 101,103,107,109 are all prime.
%t A115095 Join[{1}, Select[Range[2, 15000, 3], AllTrue[10*# - {1, 3, 7, 9}, PrimeQ] &]] (* _Paolo Xausa_, Jul 15 2025 *)
%Y A115095 Cf. A064975 (essentially the same).
%Y A115095 Cf. A038800 (number of primes between 10*n and 10*n+9).
%Y A115095 Cf. A007811.
%K A115095 nonn
%O A115095 1,2
%A A115095 _Zak Seidov_, Mar 01 2006
%E A115095 Name edited by _Paolo Xausa_, Jul 20 2025