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A080212
Binomial(n, smallest odd prime factor of n).
3
1, 2, 1, 4, 1, 20, 1, 8, 84, 252, 1, 220, 1, 3432, 455, 16, 1, 816, 1, 15504, 1330, 705432, 1, 2024, 53130, 10400600, 2925, 1184040, 1, 4060, 1, 32, 5456, 2333606220, 324632, 7140, 1, 35345263800, 9139, 658008, 1, 11480, 1, 7669339132, 14190
OFFSET
1,2
COMMENTS
For n>1: a(n)=1 iff n is prime.
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Feb 06 2003
STATUS
approved