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A079266 Subprimorials, extrapolation from primorials by analogy with subfactorials. 2
0, 1, 2, 11, 77, 850, 11047, 187806, 3568317, 82071280, 2380067130, 73782081030, 2729936998114, 111927416922654, 4812878927674125, 226205309600683885, 11988881408836245894, 707344003121338507758, 43147984190401648973266 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..18.

FORMULA

a(n) = Round(Prime(n)#/e), where p# = p primorial, with Prime(0)# = 1.

EXAMPLE

a(3) = 11 because Prime(3) = 5, 5# = 30, 30/e = 11.036...

MATHEMATICA

Table[Round[Times @@ Prime@Range@n/E], {n, 18}] (* Robert G. Wilson v, Apr 30 2009 *)

CROSSREFS

Cf. A002110, A000166.

See A121572 for a different definition of subprimorial.

Sequence in context: A221844 A006766 A120380 * A094569 A151418 A154273

Adjacent sequences:  A079263 A079264 A079265 * A079267 A079268 A079269

KEYWORD

nonn

AUTHOR

Michael Joseph Halm, Feb 05 2003

EXTENSIONS

Edited by Franklin T. Adams-Watters, Aug 08 2006

More terms from Robert G. Wilson v, Apr 30 2009

STATUS

approved

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Last modified June 27 15:06 EDT 2017. Contains 288790 sequences.