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

1,1

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.

Links

Table of n, a(n) for n=1..63.

Formula

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

Example

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

Crossrefs

Cf. A000040, A003068, A100484.

Sequence in context: A074148 A336660 A310792 * A265431 A132297 A007333

Adjacent sequences: A178904 A178905 A178906 * A178908 A178909 A178910

Keyword

nonn

Author

Jonathan Vos Post, Dec 29 2010

Extensions

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

Status

approved