A065046 Numbers k such that prime(k) - pi(k) is a prime.

1, 2, 3, 4, 7, 9, 14, 15, 16, 19, 22, 30, 38, 44, 55, 64, 79, 81, 90, 91, 93, 94, 96, 101, 113, 115, 117, 118, 121, 122, 123, 124, 125, 133, 142, 148, 163, 173, 176, 178, 182, 183, 185, 189, 190, 199, 205, 206, 208, 223, 226, 232, 239, 240, 251, 253, 255, 263

Offset: 1

Author

Robert G. Wilson v, Nov 05 2001

Keywords

• easy
• nonn

Links

• Harry J. Smith, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A065042, A111181.

Programs

Mathematica

Select[Range[300], PrimeQ[Prime[ # ] - PrimePi[ # ]] & ]

PARI

isok(m) = isprime(prime(m) - primepi(m)); \\ Harry J. Smith, Oct 04 2009