A171639 Sum of n-th nonprime number and n-th noncomposite number.

2, 6, 9, 13, 16, 21, 25, 31, 34, 39, 47, 51, 58, 63, 67, 72, 79, 86, 89, 97, 103, 106, 113, 118, 125, 135, 140, 143, 149, 153, 158, 173, 179, 186, 189, 200, 203, 211, 218, 223, 230, 237, 241, 253, 256, 261, 264, 277, 291, 296

Offset

1,1

Comments

a(n) = A008578(n) + A018252(n).

Links

Table of n, a(n) for n=1..50.

Formula

a(n) = A064799(n-1) for n >= 2.

Crossrefs

Sequence in context: A292659 A184869 A047276 * A054770 A184745 A113689

Adjacent sequences: A171636 A171637 A171638 * A171640 A171641 A171642

Keyword

nonn

Author

Jaroslav Krizek, Dec 13 2009

Status

approved