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 A256736 Number of composites lying between successive pairs of primes, beginning with pair (3,5). Bisection of A046933. 2
 1, 3, 3, 3, 1, 3, 3, 5, 5, 1, 3, 7, 1, 1, 13, 5, 9, 5, 3, 5, 9, 3, 11, 3, 3, 1, 5, 5, 5, 1, 13, 1, 13, 9, 3, 7, 5, 5, 3, 9, 9, 5, 5, 3, 3, 7, 7, 5, 1, 5, 5, 1, 9, 5, 5, 3, 11, 1, 5, 1, 3, 7, 7, 7, 5, 7, 3, 3, 9, 1, 1, 1, 13, 1, 13, 1, 19, 7, 7, 5, 13, 5, 7, 11 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Jinyuan Wang, Table of n, a(n) for n = 1..1000 EXAMPLE [3,5] contains 4, so a(1)=4. [7,11] contains 8,9,10, so a(2)=3. For the third term in the sequence, use prime pair [13,17]. There are three composites between 13 and 17, thus the third term = 3. MATHEMATICA Table[Prime[n + 1] - Prime[n] - 1, {n, 2, 100, 2}] (* Hartmut F. W. Hoft, Apr 24 2015 *) PROG (PARI) a(n) = prime(2*n+1)-prime(2*n)-1; \\ Jinyuan Wang, Jul 09 2020 CROSSREFS Complement of A256737 in regards to forming A046933. Sequence in context: A167817 A153401 A181520 * A123073 A059289 A201277 Adjacent sequences: A256733 A256734 A256735 * A256737 A256738 A256739 KEYWORD nonn AUTHOR Peter Woodward, Apr 09 2015 EXTENSIONS Corrected and extended by Hartmut F. W. Hoft, Apr 24 2015 More terms from Robert G. Wilson v, May 03 2015 STATUS approved

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Last modified February 25 09:35 EST 2024. Contains 370313 sequences. (Running on oeis4.)