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 A174185 Numbers k such that the k-th prime minus the k-th even nonprime is prime. 0
 1, 7, 8, 9, 12, 15, 19, 20, 21, 23, 24, 25, 30, 32, 33, 34, 35, 36, 37, 39, 41, 42, 45, 46, 48, 51, 56, 63, 67, 71, 75, 78, 81, 82, 85, 86, 88, 89, 90, 96, 102, 107, 112, 115, 116, 117, 120, 121, 123, 126, 128, 132, 135, 137, 146, 150, 152, 153, 156, 158, 159, 163, 164 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Numbers k such that prime(k) - (even nonprime)(k) is prime. LINKS Table of n, a(n) for n=1..63. EXAMPLE 1 is a term because A000040(1) - A163300(1) = 2 (prime); 7 is a term because A000040(7) - A163300(7) = 3 (prime). MAPLE 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 300 do if isprime( ithprime(n) - A163300(n)) then printf("%d, ", n) ; end if; end do: # R. J. Mathar, Apr 20 2010 CROSSREFS Cf. A000040, A163300. Sequence in context: A192050 A045158 A074328 * A309152 A170933 A297257 Adjacent sequences: A174182 A174183 A174184 * A174186 A174187 A174188 KEYWORD nonn AUTHOR Juri-Stepan Gerasimov, Mar 11 2010 EXTENSIONS Corrected (11 replaced with 12) by R. J. Mathar, Apr 20 2010 STATUS approved

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Last modified June 18 17:48 EDT 2024. Contains 373483 sequences. (Running on oeis4.)