A361127 Let p = n-th odd prime; a(n) = index where 2*p appears in A360519, or -1 if 2*p never appears.

2, 3, 11, 16, 28, 24, 32, 40, 48, 51, 55, 59, 84, 96, 104, 120, 123, 127, 144, 148, 160, 164, 176, 200, 203, 207, 208, 211, 236, 252, 260, 276, 280, 304, 308, 312, 332, 336, 344, 368, 376, 388, 392, 400, 404, 428, 452, 468, 472, 480, 496, 500, 508, 520, 532, 556, 560

Offset: 1

Author

Scott R. Shannon and N. J. A. Sloane, Mar 08 2023

Keywords

• nonn

Comments

It is conjectured that every 2*prime(n) (n>1) appears in A360519. A proof of this would be a big step towards proving that every term of C appears in A360519.

Examples

			p = 11 is the 4th odd prime, and A360519(16) = 2*11 = 22, so a(4) = 16.
		

Links

• N. J. A. Sloane, Table of n, a(n) for n = 1..5062

Crossrefs

Cf. A360519, A360103.