A174008 n-th prime plus n-th even nonnegative nonprime.

2, 7, 11, 15, 21, 25, 31, 35, 41, 49, 53, 61, 67, 71, 77, 85, 93, 97, 105, 111, 115, 123, 129, 137, 147, 153, 157, 163, 167, 173, 189, 195, 203, 207, 219, 223, 231, 239, 245, 253, 261, 265, 277, 281, 287, 291, 305, 319, 325, 329, 335, 343, 347, 359, 367, 375

Offset: 1

Author

Juri-Stepan Gerasimov, Mar 05 2010

Keywords

• nonn
• easy
• less

Comments

Apart from the first term, same as A078916 = prime(n) + 2n.

Examples

			a(1)=2 because 2+0=2; a(2)=7 because 3+4=7.
		

Crossrefs

Cf. A000040, A001477, A078916, A163300.

Programs

Maple

Contribution from R. J. Mathar, Apr 14 2010: (Start)
A163300 := proc(n) option remember ; if n = 1 then 0; else for a from procname(n-1)+2 by 2 do if not isprime(a) then return a ; end if; end do; end if; end proc:
A174008 := proc(n) ithprime(n)+A163300(n) ; end proc: seq(A174008(n),n=1..80) ; (End)

Formula

a(n)=A000040(n)+A163300(n).

a(n) ~ n log n.