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 A071127 Number of times there is a prime p < n such that 2n+p is prime. 3
 0, 0, 0, 1, 1, 1, 2, 2, 1, 1, 1, 2, 3, 2, 3, 2, 3, 4, 2, 4, 4, 2, 2, 5, 4, 2, 5, 5, 2, 6, 3, 3, 6, 4, 4, 5, 3, 5, 6, 4, 3, 6, 5, 3, 8, 3, 6, 8, 5, 5, 6, 4, 4, 7, 6, 2, 6, 4, 3, 11, 5, 4, 9, 5, 5, 9, 7, 6, 9, 6, 3, 10, 6, 4, 11, 7, 6, 10, 5, 9, 11, 5, 6, 12, 8, 5, 10, 6, 6, 13, 7, 6, 11, 8, 8, 11, 7, 8, 11 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,7 LINKS T. D. Noe, Table of n, a(n) for n=1..10000 EXAMPLE a(7)=2 because 14+3 and 14+5 are primes. MATHEMATICA For[lst={}; n=1, n<=100, n++, cnt=0; k=1; While[Prime[k]

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Last modified July 24 21:09 EDT 2024. Contains 374585 sequences. (Running on oeis4.)