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
Offset: 1
Keywords
Examples
a(9) = 675 = 25 * 27, as 23 is the 9th prime and 29 is the 10th prime.
Links
- Harry J. Smith, Table of n, a(n) for n=1,...,2000
Programs
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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","))
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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
Extensions
More terms from Ralf Stephan, Mar 31 2003
First term removed by Harry J. Smith, Jul 19 2009