A065308 a(n) = prime(n - pi(n)).

2, 2, 2, 3, 3, 5, 5, 7, 11, 13, 13, 17, 17, 19, 23, 29, 29, 31, 31, 37, 41, 43, 43, 47, 53, 59, 61, 67, 67, 71, 71, 73, 79, 83, 89, 97, 97, 101, 103, 107, 107, 109, 109, 113, 127, 131, 131, 137, 139, 149, 151, 157, 157, 163, 167, 173, 179, 181, 181, 191, 191, 193, 197

Offset: 1

Author

Labos Elemer, Oct 29 2001

Keywords

• nonn

Examples

			For n=100, pi(100) = 25, prime(100-25) = prime(75) = 379 = a(100).
		

Links

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

Crossrefs

Cf. A000040, A000720, A065309, A065310.

Programs

Maple

with(numtheory); A065308:=n->ithprime(n-pi(n)); seq(A065308(n), n=1..100); # Wesley Ivan Hurt, Feb 26 2014

Mathematica

Table[Prime[n - PrimePi[n]], {n, 100}] (* Wesley Ivan Hurt, Feb 26 2014 *)

PARI

a(n) = { prime(n - primepi(n)) } \\ Harry J. Smith, Oct 16 2009