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A256737 Number of composites lying between successive pairs of primes, beginning with pair (2,3). Bisection of A046933. 1
0, 1, 1, 1, 5, 5, 1, 5, 1, 3, 5, 5, 3, 3, 3, 3, 1, 1, 5, 5, 1, 1, 1, 11, 1, 5, 9, 5, 1, 3, 9, 3, 3, 5, 1, 5, 5, 3, 7, 7, 1, 1, 3, 7, 1, 11, 3, 3, 11, 17, 9, 5, 5, 5, 1, 5, 1, 9, 3, 5, 11, 5, 9, 9, 5, 3, 5, 7, 13, 11, 9, 3, 9, 3, 3, 3, 3, 3, 9, 3, 5, 3, 5, 5, 3, 1, 1, 9, 9, 5, 3, 3, 5, 5, 21 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,5
LINKS
EXAMPLE
For the third term in the sequence, use prime pair (11,13). Only composite that lies between is "12", thus the third value in the sequence is "1".
MATHEMATICA
Flatten[Differences/@Partition[Prime[Range[200]], 2]]-1 (* Harvey P. Dale, Dec 17 2023 *)
PROG
(PARI) a(n)=my(q=prime(2*n)); q-precprime(q-1)-1 \\ Charles R Greathouse IV, Apr 21 2015
CROSSREFS
Complement of A256736 with respect to A046933.
Sequence in context: A282969 A046095 A322545 * A055183 A198740 A082956
KEYWORD
nonn
AUTHOR
Peter Woodward, Apr 09 2015
STATUS
approved

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Last modified February 25 19:44 EST 2024. Contains 370332 sequences. (Running on oeis4.)