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%I #27 Sep 09 2022 23:37:58
%S 1,11,19,29,31,41,59,61,71,79,89,101,109,121,131,139,149,151,179,181,
%T 191,199,209,211,229,239,241,251,269,271,281,311,319,331,341,349,359,
%U 361,379,389,401,409,419,421,431,439,449,451,461,479,491,499,509
%N Multiplicative closure of A045468: numbers which are the product of zero or more primes which are 1 or 4 mod 5.
%C The subsequence of A089270 which excludes terms divisible by 5.
%H David Friend, <a href="/A336403/b336403.txt">Table of n, a(n) for n = 1..10000</a>
%H David Friend, <a href="/A336403/a336403_1.pdf">Fibonacci-Like Sequences and their Cassini Constants, Multiplication and Factorisation</a>
%F 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 Cf. A031363 and its subset A089270 and its subset A038872 and its subset A045468.
%K nonn,easy
%O 1,2
%A _David Friend_, Jul 20 2020
%E New name and general cleanup by _Charles R Greathouse IV_, Sep 09 2022
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