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Smallest k >= 2*n such that k is a prime or twice a prime.
2

%I #4 Oct 05 2021 00:07:20

%S 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 53,53,53,58,58,58,61,62,67,67,71,71,73,74,79,79,82,82,86,86,89,94,94,

%U 94,97,101,101,103,106,106,109,113,113,118,118,118,122,122,127,127,131,131,134

%N Smallest k >= 2*n such that k is a prime or twice a prime.

%C Suggested by the formula for A016726.

%Y Cf. A016726, A347694.

%K nonn

%O 0,1

%A _N. J. A. Sloane_, Oct 04 2021