A109937 Number of consecutive composite numbers in successive consecutive number sets in A109936; (smallest (n+1)-digit prime) - (largest n-digit prime) - 1.

3, 3, 11, 33, 11, 19, 27, 17, 69, 51, 25, 49, 65, 57, 47, 123, 5, 13, 89, 49, 217, 35, 139, 263, 135, 207, 201, 539, 345, 67, 59, 69, 69, 603, 91, 225, 123, 191, 59, 137, 227, 145, 137, 83, 17, 153, 73, 225, 65, 207, 443, 557, 347, 321, 131, 595, 371, 307, 159, 167

Offset: 1

Author

Amarnath Murthy, Jul 19 2005

Keywords

• base
• nonn

Crossrefs

Cf. A109936.

Programs

Maple

A003617 := proc(n) nextprime(10^(n-1)) ; end: A003618 := proc(n) prevprime(10^n) ; end: A038804 := proc(n) A003617(n+1)-A003618(n) ; end: A109937 := proc(n) A038804(n)-1 ; end: seq(A109937(n),n=1..60) ; # R. J. Mathar, Feb 08 2008

Formula

a(n) = A038804(n)-1. - R. J. Mathar, Feb 08 2008

Extensions

More terms from R. J. Mathar, Feb 08 2008