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A174008 n-th prime plus n-th even nonnegative nonprime. 3
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 (list; graph; refs; listen; history; text; internal format)
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: A018308 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

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Last modified August 25 05:19 EDT 2019. Contains 326318 sequences. (Running on oeis4.)