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 A159704 Number of different pairs of primes p,q such that : p
 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 2, 1, 1, 2, 1, 1, 2, 0, 1, 0, 1, 0, 2, 2, 1, 4, 2, 2, 4, 1, 2, 2, 0, 1, 0, 1, 0, 2, 2, 1, 4, 2, 2, 4, 1, 2, 2, 1, 1, 2, 2, 1, 4, 3, 2, 6, 4, 3, 8, 3, 4, 6, 1, 3, 2, 2, 1, 4, 3, 2, 6, 4, 3, 8, 1, 4, 2, 0, 1, 0, 2, 0, 4, 3, 2, 6, 3, 3, 6, 2, 3, 4, 1, 2, 2, 1, 1, 2, 3, 1, 6, 4, 3, 8 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,12 COMMENTS conjecture : for n>5573 there is at least one such pair of primes p+q=2*n LINKS Pierre CAMI, Table of n, a(n) for n=1..50000 EXAMPLE 11+13=24,7+17=24 so for n=12 2 pairs p,q such that p+q=2*12, p

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Last modified April 21 13:53 EDT 2021. Contains 343154 sequences. (Running on oeis4.)