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 A306997 Number of primes q < prime(n), such that 6*prime(n) + q is prime. 2
 0, 0, 0, 1, 2, 2, 3, 2, 3, 5, 4, 6, 6, 5, 3, 5, 6, 7, 10, 10, 9, 7, 8, 12, 10, 9, 9, 10, 13, 10, 8, 11, 12, 12, 14, 12, 14, 16, 17, 11, 16, 17, 16, 14, 15, 17, 17, 14, 18, 17, 18, 21, 21, 20, 20, 17, 18, 19, 20, 18, 17, 21, 23, 23, 17, 24, 26, 23, 25, 24, 23, 25, 24, 24, 29, 25, 26, 26, 28, 28, 26, 33, 30, 25, 25, 30, 31, 25, 25, 31, 23, 29, 30, 30, 30 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,5 COMMENTS Conjecture: a(n) > 0 for all n >= 4. - Dmitry Kamenetsky, Mar 18 2019 LINKS Table of n, a(n) for n=1..95. CROSSREFS Cf. A306995, A306996. Sequence in context: A080092 A164738 A126225 * A056160 A106245 A374233 Adjacent sequences: A306994 A306995 A306996 * A306998 A306999 A307000 KEYWORD nonn AUTHOR Dmitry Kamenetsky, Mar 18 2019 STATUS approved

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Last modified July 23 21:46 EDT 2024. Contains 374575 sequences. (Running on oeis4.)