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

1,1

Comments

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

Links

Table of n, a(n) for n=1..56.

Formula

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

a(n) ~ n log n.

Example

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

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)

Crossrefs

Cf. A000040, A001477, A078916, A163300.

Sequence in context: A329868 A184485 A001960 * A140491 A122823 A063289

Adjacent sequences: A174005 A174006 A174007 * A174009 A174010 A174011

Keyword

nonn,easy,less

Author

Juri-Stepan Gerasimov, Mar 05 2010

Status

approved