OFFSET
1,6
COMMENTS
a(n)=0 if and only if n is a prime or n=4. - Emeric Deutsch, Aug 05 2005
EXAMPLE
a(9) = (6! + 7! + 8!)/9 = 5120.
MAPLE
a:=proc(n) local A, k: A:={}: for k from 0 to n-1 do if k! mod n = 0 then A:=A union {k} else A:=A: fi od: sum(A[j]!, j=1..nops(A))/n end: seq(a(n), n=1..27); # Emeric Deutsch, Aug 05 2005
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Amarnath Murthy, Aug 01 2005
EXTENSIONS
More terms from Emeric Deutsch, Aug 05 2005
STATUS
approved