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A342648

Composite numbers k such that k-A238525(k) and k+A238525(k) are prime.

6, 10, 12, 22, 142, 274, 382, 694, 862, 922, 2122, 2182, 2962, 3334, 3862, 4054, 4282, 4474, 5374, 6514, 6742, 6934, 7534, 7702, 8254, 8482, 8674, 8962, 10042, 10834, 11734, 13402, 13654, 14254, 14662, 14914, 15094, 15514, 15754, 16462, 17074, 18022, 18874, 19714, 20074, 20182, 22234, 23434

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OFFSET

1,1

COMMENTS

If p, p+2 and 3*p-2 are prime then 2*p is a term.

Is 12 the only term not of this form?

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000

EXAMPLE

a(4) = 22 is a term because A238525(22) = 9 and 22-9 = 13 and 22+9 = 31 are prime.

MAPLE

filter:= proc(n) local t, s, r;