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A186944
Geometric mean of n-th row of A080508.
0
1, 2, 2, 6, 6, 30, 30, 210, 210, 210, 210, 2310, 2310, 30030, 30030, 30030, 30030, 510510, 510510, 9699690, 9699690, 9699690, 9699690, 223092870, 223092870, 223092870, 223092870, 223092870, 223092870, 6469693230, 6469693230, 200560490130, 200560490130
OFFSET
1,2
FORMULA
For n != 2, a(n) = A034386(n-1). - Jeppe Stig Nielsen, Nov 04 2018
PROG
(PARI) a(n) = {if (n == 1, return (1)); if (n == 2, return (2)); f = factor((n-1)!); prod(i=1, #f~, f[i, 1]); } \\ Michel Marcus, Aug 30 2013
(PARI) a(n) = if(n==2, 2, prod(i=1, primepi(n-1), prime(i))) \\ Jeppe Stig Nielsen, Nov 04 2018
CROSSREFS
Cf. A080509.
Sequence in context: A056038 A076929 A265642 * A247525 A305295 A174789
KEYWORD
nonn
AUTHOR
Michel Marcus, Aug 30 2013
STATUS
approved