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A096007 Scan Pascal's triangle (A007318) from left to right, record smallest prime factor of each entry. 0
2, 3, 3, 2, 2, 2, 5, 2, 2, 5, 2, 3, 2, 3, 2, 7, 3, 5, 5, 3, 7, 2, 2, 2, 2, 2, 2, 2, 3, 2, 2, 2, 2, 2, 2, 3, 2, 3, 2, 2, 2, 2, 2, 3, 2, 11, 5, 3, 2, 2, 2, 2, 3, 5, 11, 2, 2, 2, 3, 2, 2, 2, 3, 2, 2, 2, 13, 2, 2, 5, 3, 2, 2, 3, 5, 2, 2, 13, 2, 7, 2, 7, 2, 3, 2, 3, 2, 7, 2, 7, 2, 3, 3, 5, 3, 3, 5, 3, 3, 5, 3, 3, 5, 3 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..104.

EXAMPLE

n Pascal's Triangle

1 1

2 1 2 1

3 1 3 3 1

4 1 4 6 4 1

so 2, 2, 2 = smallest prime factors of row 4 = entries position 4, 5, 6 in the sequence.

PROG

(PARI) \Smallest prime factors of numbers in Pascal's triangle. pascal(n) = { local(x, y, z, f, z1); for(x=1, n, for(y=1, x-1, z=binomial(x, y); f=Vec(factor(z)); z1=f[1][1]; print1(z1", ") ); ) }

CROSSREFS

Cf. A007318.

Sequence in context: A011154 A048466 A096838 * A269043 A059252 A251619

Adjacent sequences:  A096004 A096005 A096006 * A096008 A096009 A096010

KEYWORD

easy,nonn

AUTHOR

Cino Hilliard, Jul 25 2004

STATUS

approved

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Last modified August 20 18:56 EDT 2019. Contains 326154 sequences. (Running on oeis4.)