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A256736 Number of composites lying between successive pairs of primes, beginning with pair (3,5). Bisection of A046933. 1
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, 5, 9, 5, 1, 1, 17 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..90.

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 *)

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,more

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 March 28 14:24 EDT 2020. Contains 333089 sequences. (Running on oeis4.)