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A274507 Primes one more than the sum over a pair of prime numbers that differ by 8. 1
19, 31, 67, 127, 151, 211, 271, 307, 547, 727, 787, 811, 907, 967, 991, 1447, 1531, 1831, 1867, 2131, 2467, 2647, 2887, 2971, 3967, 5107, 5227, 5407, 5431, 5827, 6091, 6427, 6451, 6607, 6907, 6991, 7411, 8191, 8431, 8707, 9511, 10111 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Any prime p in this sequence is such that p = (p-9)/2 + (p+7)/2 + 1, where (p-9)/2 and (p+7)/2 are also primes and they differ by 8.
This sequence is infinite under Dickson's conjecture. - Charles R Greathouse IV, Jul 08 2016
LINKS
EXAMPLE
19 = 5 + 13 + 1. Note that, (19-9)/2 = 5 and (19+7)/2 = 13 and the prime pairs 5 and 13 differ by 8.
31 = 11 + 19 + 1. Note that, (31-9)/2 = 11 and (31+7)/2 = 19 and the prime pairs 11 and 19 differ by 8.
MATHEMATICA
Select[2 # + 9 &@ Select[Prime@ Range[10^3], PrimeQ[# + 8] &], PrimeQ] (* Michael De Vlieger, Jun 26 2016 *)
PROG
(PARI) lista(nn)=forprime(p=3, nn, if (isprime(p+8) && isprime(q=2*p+9), print1(q, ", "))); \\ Michel Marcus, Jun 25 2016
CROSSREFS
A subsequence of A068229 and also of A145472.
Sequence in context: A141184 A033212 A104227 * A032743 A106861 A107168
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified July 17 04:55 EDT 2024. Contains 374360 sequences. (Running on oeis4.)