A061215 - OEIS

A061215

a(n)= product of all odd composite numbers between n-th prime and (n+1)-st prime.

1, 1, 1, 9, 1, 15, 1, 21, 675, 1, 1155, 39, 1, 45, 2499, 3135, 1, 4095, 69, 1, 5775, 81, 7395, 803985, 99, 1, 105, 1, 111, 2978730129375, 129, 17955, 1, 429774345, 1, 23715, 25599, 165, 28899, 30975, 1, 1196537265, 1, 195, 1, 361878338745

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,4

LINKS

Harry J. Smith, Table of n, a(n) for n=1,...,2000

EXAMPLE

a(9) = 675 = 25 * 27, as 23 is the 9th prime and 29 is the 10th prime.

PROG

(PARI) for(n=1, 60, p=1:for(k=prime(n)+1, prime(n+1)-1, if(k%2==1, p=p*k)):print1(p", "))

(PARI) { n=0; q=2; forprime (p=3, prime(2001), a=1; for (i=q + 1, p - 1, if (i%2==1, a*=i)); q=p; write("b061215.txt", n++, " ", a) ) } \\ Harry J. Smith, Jul 19 2009

CROSSREFS

Sequence in context: A107829 A062357 A348974 * A072448 A145966 A349143

Adjacent sequences: A061212 A061213 A061214 * A061216 A061217 A061218

KEYWORD

nonn

AUTHOR

Amarnath Murthy, Apr 22 2001

EXTENSIONS

More terms from Ralf Stephan, Mar 31 2003

First term removed by Harry J. Smith, Jul 19 2009

STATUS

approved