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A361009 Positive integers k such that 2*k cannot be expressed p^2-q where p and q are primes. 0

%I #5 Feb 28 2023 08:21:01

%S 5,8,14,17,20,26,29,32,35,38,41,44,47,50,53,56,62,65,68,71,72,74,77,

%T 80,86,89,92,95,98,101,104,107,110,113,116,119,122,125,128,131,134,

%U 137,140,146,149,152,155,158,161,164,167,170,173,176,182,185,188,191,194,197

%N Positive integers k such that 2*k cannot be expressed p^2-q where p and q are primes.

%C Most of the terms are congruent to 1 mod 3, but some terms of A016789 are missing.

%C A few terms are divisible by 3 (A008585).

%Y Cf. A000040, A001248, A109619.

%Y Cf. A008585, A016789.

%K nonn

%O 1,1

%A _Michel Marcus_, Feb 28 2023

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Last modified August 31 03:15 EDT 2024. Contains 375550 sequences. (Running on oeis4.)