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 A256416 #15 Apr 06 2015 06:09:58 %S A256416 1,4,4,4,6,6,8,10,10,10,12,14,14,14,16,18,20,22,22,22,24,25,26,26,26, %T A256416 27,28,30,32,34,34,34,35,36,38,38,38,40,42,44,45,46,46,46,48,49,50,52, %U A256416 54,55,56,58,58,58,60,62,62,62,63,64,65,66 %N A256416 Positive integers with primes p replaced by 2p and also 3p replaced by 2p, then sorted into increasing order. %C A256416 Odd primes p and three times odd primes are missing; twice primes (except 6) each appear three times. %C A256416 The smoothed version of A064413 (A256417) is a rearrangement of these terms. %H A256416 N. J. A. Sloane, <a href="/A256416/b256416.txt">Table of n, a(n) for n = 1..10000</a> %Y A256416 Cf. A064413, A256415 (the unsorted sequence), A256417. %K A256416 nonn %O A256416 1,2 %A A256416 _N. J. A. Sloane_, Apr 05 2015