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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
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
Sequence in context: A262300 A202105 A076297 * A278485 A279064 A294109
KEYWORD
nonn
AUTHOR
EXTENSIONS
Entries checked by R. J. Mathar, Apr 20 2010
STATUS
approved

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Last modified June 16 07:19 EDT 2024. Contains 373423 sequences. (Running on oeis4.)