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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

For n>1: a(n)=1 iff n is prime.

LINKS

Table of n, a(n) for n=1..45.

CROSSREFS

Cf. A078701, A080211, A080213.

Sequence in context: A128271 A092891 A229484 * A186727 A145998 A218952

Adjacent sequences:  A080209 A080210 A080211 * A080213 A080214 A080215

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Feb 06 2003

STATUS

approved

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Last modified June 23 21:09 EDT 2021. Contains 345402 sequences. (Running on oeis4.)