A173137 n-th nonnegative noncomposite number plus n.

1, 3, 5, 7, 10, 13, 18, 21, 26, 29, 34, 41, 44, 51, 56, 59, 64, 71, 78, 81, 88, 93, 96, 103, 108, 115, 124, 129, 132, 137, 140, 145, 160, 165, 172, 175, 186, 189, 196, 203, 208, 215, 222, 225, 236, 239, 244, 247, 260, 273, 278, 281, 286, 293, 296, 307, 314, 321

Offset: 1

Author

Juri-Stepan Gerasimov, Feb 10 2010

Keywords

• nonn
• easy
• less

Examples

			a(1) = 0 + 1 = 1, a(2) = 1 + 2 = 3, a(3) = 2 + 3 = 5,
a(4) = 3 + 4 = 7, a(5) = 5 + 5 = 10.
		

Programs

Magma

[1] cat [NthPrime(n-1)+n+1: n in [1..58] ]; // Vincenzo Librandi, Dec 08 2015

Mathematica

Join[{1}, Table[Prime[n - 1] + n + 1, {n, 2, 60}]] (* Vincenzo Librandi, Dec 08 2015 *)

Formula

a(n) = A158611(n) + A000027(n).

Extensions

Corrected by Charles R Greathouse IV, Mar 25 2010