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

%I #8 Aug 09 2015 13:10:41

%S 3,3,11,33,11,19,27,17,69,51,25,49,65,57,47,123,5,13,89,49,217,35,139,

%T 263,135,207,201,539,345,67,59,69,69,603,91,225,123,191,59,137,227,

%U 145,137,83,17,153,73,225,65,207,443,557,347,321,131,595,371,307,159,167

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

%F a(n) = A038804(n)-1. - _R. J. Mathar_, Feb 08 2008

%p 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

%Y Cf. A109936.

%K base,nonn

%O 1,1

%A _Amarnath Murthy_, Jul 19 2005

%E More terms from _R. J. Mathar_, Feb 08 2008

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Last modified May 11 10:40 EDT 2024. Contains 372409 sequences. (Running on oeis4.)