A178907 n-th prime + n-th problime (third definition).

4, 7, 12, 18, 26, 32, 40, 47, 56, 67, 74, 85, 94, 101, 110, 121, 132, 140, 152, 162, 170, 182, 192, 204, 218, 228, 236, 246, 254, 264, 284, 294, 306, 314, 330, 338, 350, 362, 372, 384, 396, 405, 422, 431, 442, 451, 470, 489, 500, 509, 520, 533, 542, 559, 572, 585, 598, 607, 620, 631, 640, 657, 678

Offset: 1

Author

Jonathan Vos Post, Dec 29 2010

Keywords

• nonn

Comments

The partial sequence of values which are themselves primes begins: 7, 47, 101. The partial sequence of values which are themselves problimes (third definition) begins: 4, 7, 85, 121.

Examples

			a(10) = prime(10) + A003068(10) = 29 + 38 = 67 is prime.
		

Crossrefs

Cf. A000040, A003068, A100484.

Formula

a(n) = A000040(n) + A003068(n).

Extensions

Corrected and extended. - R. J. Mathar, Oct 20 2013