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A124582
Primes p such that q-p >= 6, where q is the next prime after p.
9
23, 31, 47, 53, 61, 73, 83, 89, 113, 131, 139, 151, 157, 167, 173, 181, 199, 211, 233, 241, 251, 257, 263, 271, 283, 293, 317, 331, 337, 353, 359, 367, 373, 383, 389, 401, 409, 421, 433, 443, 449, 467, 479, 491, 503, 509, 523, 541, 547, 557, 563, 571, 577
OFFSET
1,1
FORMULA
a(n) ~ n log n. - Charles R Greathouse IV, Jun 04 2015
MAPLE
d:=6; M:=1000; t0:=[]; for n from 1 to M do p:=ithprime(n); if nextprime(p) - p >= d then t0:=[op(t0), p]; fi; od: t0;
MATHEMATICA
t={}; q=6; Do[If[Prime[n+6]-Prime[n+5]>=q, AppendTo[t, Prime[n+5]]], {n, 1, 200}]; t (* Vladimir Joseph Stephan Orlovsky, Feb 02 2012 *)
Transpose[Select[Partition[Prime[Range[200]], 2, 1], #[[2]]-#[[1]] >= 6&]] [[1]] (* Harvey P. Dale, May 15 2013 *)
PROG
(PARI) is(n)=!isprime(n+2) && !isprime(n+4) && n>2 && isprime(n) \\ Charles R Greathouse IV, Jun 04 2015
CROSSREFS
Complement of A124589.
Sequence in context: A256872 A276435 A083370 * A130796 A258578 A031924
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Dec 19 2006
STATUS
approved