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 A336403 #27 Sep 09 2022 23:37:58 %S A336403 1,11,19,29,31,41,59,61,71,79,89,101,109,121,131,139,149,151,179,181, %T A336403 191,199,209,211,229,239,241,251,269,271,281,311,319,331,341,349,359, %U A336403 361,379,389,401,409,419,421,431,439,449,451,461,479,491,499,509 %N A336403 Multiplicative closure of A045468: numbers which are the product of zero or more primes which are 1 or 4 mod 5. %C A336403 The subsequence of A089270 which excludes terms divisible by 5. %H A336403 David Friend, <a href="/A336403/b336403.txt">Table of n, a(n) for n = 1..10000</a> %H A336403 David Friend, <a href="/A336403/a336403_1.pdf">Fibonacci-Like Sequences and their Cassini Constants, Multiplication and Factorisation</a> %F A336403 Numbers of the form r^2 + 3*r*s + s^2 not divisible by 5, where r and s are relatively prime and r > s >= 0. %Y A336403 Cf. A031363 and its subset A089270 and its subset A038872 and its subset A045468. %K A336403 nonn,easy %O A336403 1,2 %A A336403 _David Friend_, Jul 20 2020 %E A336403 New name and general cleanup by _Charles R Greathouse IV_, Sep 09 2022