A118747 a(n) = product[k=1..n] P(k), where P(k) is the largest prime <= 2*k. a(n) = product[k=1..n] A060308(k).

2, 6, 30, 210, 1470, 16170, 210210, 2732730, 46456410, 882671790, 16770764010, 385727572230, 8871734161290, 204049885709670, 5917446685580430, 183440847252993330, 5686666264842793230, 176286654210126590130

Offset

1,1

Links

Table of n, a(n) for n=1..18.

Crossrefs

Cf. A020482, A049653, A060266-A060268, A060264, A060265, A060308, A118455, A118456, A118748.

Sequence in context: A211211 A127482 A372741 * A129779 A068215 A305400

Adjacent sequences: A118744 A118745 A118746 * A118748 A118749 A118750

Keyword

easy,nonn

Author

Jonathan Vos Post, Apr 29 2006

Status

approved