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Search: id:A061215
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| A061215 |
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a(n)= product of all odd composite numbers between n-th prime and (n+1)-st prime. |
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+0
2
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| 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; listen)
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OFFSET
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1,4
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LINKS
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Harry J. Smith, Table of n, a(n) for n=1,...,2000
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EXAMPLE
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a(9) = 675 = 25 X 27, as 23 is the 9-th prime and 29 is the 10-th prime.
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PROGRAM
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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", "))
(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) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Jul 19 2009]
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CROSSREFS
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Sequence in context: A164791 A107829 A062357 this_sequence A072448 A145966 A014721
Adjacent sequences: A061212 A061213 A061214 this_sequence A061216 A061217 A061218
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KEYWORD
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nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 22 2001
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EXTENSIONS
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More terms from Ralf Stephan (ralf(AT)ark.in-berlin.de), Mar 31 2003
Removed first term. - Harry J. Smith (hjsmithh(AT)sbcglobal.net), Jul 19 2009
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