A062310 Number of ways writing n! as a sum of two nonprime numbers.

0, 1, 0, 6, 42, 271, 2029, 16880, 156002, 1594424, 17875651, 217325325, 2858334613, 40361092223, 609787506215

Offset

1,4

Links

Table of n, a(n) for n=1..15.

Formula

A062610(n!) = number of nonprime+nonprime partitions of n!.

Example

n=4, 4!=24=2+22=4+20=6+18=8+16=12+12=9+15, so a(4)=6.

Crossrefs

Cf. A062610, A000142.

Sequence in context: A343363 A331706 A074429 * A377198 A229247 A105482

Adjacent sequences: A062307 A062308 A062309 * A062311 A062312 A062313

Keyword

nonn

Author

Labos Elemer, Jul 05 2001

Extensions

a(9)-a(15) from Donovan Johnson, Oct 05 2010

Status

approved