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 A175281 #5 Oct 30 2024 10:27:37 %S A175281 1,2,3,6,13,16,23,27,52,58,101,118,146,156,177,188,248,261,331,426, %T A175281 443,552,591,716,853,926,1248,1336,1427,1521,1553,1651,1752,1963,2148, %U A175281 2502,2543,2753,2883,3016,3061,3152,3338,3433,3481,4083,4241,4511,4566,4846 %N A175281 Numbers k such that 6k+1 is a term in A005471. %e A175281 k=1: 6k+1 = 7 = A005471(1). %e A175281 k=2: 6k+1 = 13 = A005471(2). %e A175281 k=3: 6k+1 = 19 = A005471(3). %e A175281 k=6: 6k+1 = 37 = A005471(4). %Y A175281 Cf. A005471 (primes of form k^2 + 3*k + 9). %K A175281 nonn %O A175281 1,2 %A A175281 _Zak Seidov_, Mar 20 2010