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A174184 Prime(n)+even nonprime(n) is prime. 0
1, 2, 3, 7, 9, 11, 12, 13, 14, 18, 24, 27, 28, 29, 30, 36, 38, 43, 44, 53, 54, 55, 57, 60, 63, 64, 65, 66, 72, 74, 80, 84, 90, 93, 102, 103, 108, 110, 111, 117, 118, 125, 126, 135, 138, 141, 143, 148, 150, 155, 156, 162, 165, 171, 174, 180, 183, 186, 188, 190, 198 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Unit together with prime(n)+s*n is prime, s=2.

LINKS

Table of n, a(n) for n=1..61.

FORMULA

a(n+1)=A076297(n).

EXAMPLE

1 is in the sequence because A000040(1) + A163300(1) = 2 (1st prime) + 0 (1st even nonprime) is prime;

2 is in the sequence because A000040(2) + A163300(2) = 3 (2nd prime) + 4 (2nd even nonprime) is prime.

MAPLE

From R. J. Mathar, Apr 20 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:

for n from 1 to 200 do if isprime( ithprime(n) + A163300(n)) then printf("%d, ", n) ; end if; end do: (End)

CROSSREFS

Cf. A000040, A076297, A163300.

Sequence in context: A262300 A202105 A076297 * A278485 A279064 A294109

Adjacent sequences:  A174181 A174182 A174183 * A174185 A174186 A174187

KEYWORD

nonn

AUTHOR

Juri-Stepan Gerasimov, Mar 11 2010

EXTENSIONS

Entries checked by R. J. Mathar, Apr 20 2010

STATUS

approved

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Last modified June 25 07:53 EDT 2019. Contains 324347 sequences. (Running on oeis4.)