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

Author

Jaroslav Krizek, Dec 13 2009

Keywords

• nonn

Comments

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

Formula

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