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 A347693 #4 Oct 05 2021 00:07:20 %S A347693 2,2,4,6,10,10,13,14,17,19,22,22,26,26,29,31,34,34,37,38,41,43,46,46, %T A347693 53,53,53,58,58,58,61,62,67,67,71,71,73,74,79,79,82,82,86,86,89,94,94, %U A347693 94,97,101,101,103,106,106,109,113,113,118,118,118,122,122,127,127,131,131,134 %N A347693 Smallest k >= 2*n such that k is a prime or twice a prime. %C A347693 Suggested by the formula for A016726. %Y A347693 Cf. A016726, A347694. %K A347693 nonn %O A347693 0,1 %A A347693 _N. J. A. Sloane_, Oct 04 2021