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A111059 Product{k=1 to n} (A005117(k)), the product of the first n squarefree positive integers. 3
1, 2, 6, 30, 180, 1260, 12600, 138600, 1801800, 25225200, 378378000, 6432426000, 122216094000, 2566537974000, 56463835428000, 1298668214844000, 33765373585944000, 979195833992376000, 29375875019771280000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Charles R Greathouse IV, Table of n, a(n) for n = 1..417

EXAMPLE

Since the first 6 squarefree positive integers are 1, 2, 3, 5, 6, 7, the 6th term of the sequence is 1*2*3*5*6*7 = 1260.

MATHEMATICA

Rest[FoldList[Times, 1, Select[Range[40], SquareFreeQ]]] (* Harvey P. Dale, Jun 14 2011 *)

PROG

(PARI) m=30; k=1; for(n=1, m, if(issquarefree(n), print1(k=k*n, ", ")))

CROSSREFS

Cf. A005117.

Sequence in context: A180896 A180897 A096769 * A009645 A274966 A246541

Adjacent sequences:  A111056 A111057 A111058 * A111060 A111061 A111062

KEYWORD

nonn

AUTHOR

Leroy Quet, Oct 07 2005

EXTENSIONS

More terms from Klaus Brockhaus, Oct 08 2005

STATUS

approved

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Last modified November 19 10:44 EST 2017. Contains 294936 sequences.