A167480 a(n)= primepi(n) if n is prime, otherwise a(n)=prime(n).

2, 1, 2, 7, 3, 13, 4, 19, 23, 29, 5, 37, 6, 43, 47, 53, 7, 61, 8, 71, 73, 79, 9, 89, 97, 101, 103, 107, 10, 113, 11, 131, 137, 139, 149, 151, 12, 163, 167, 173, 13, 181, 14, 193, 197, 199, 15, 223, 227, 229, 233, 239, 16, 251, 257, 263, 269, 271, 17, 281, 18, 293, 307

Offset

1,1

Links

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

Mathematica

Table[If[PrimeQ[n], PrimePi[n], Prime[n]], {n, 1, 200}]

Crossrefs

Cf. A068519 a(n)=n if n is prime otherwise a(n)=prime(n), A175027 a(n)=n if n is nonprime otherwise a(n)=primepi(n).

Sequence in context: A278710 A011241 A261879 * A241738 A021051 A113246

Adjacent sequences: A167477 A167478 A167479 * A167481 A167482 A167483

Keyword

nonn

Author

Zak Seidov, Nov 04 2009

Status

approved