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A171783 Third smallest divisor of smallest number having exactly n divisors. 3
4, 3, 4, 3, 4, 3, 3, 3, 4, 3, 4, 3, 3, 3, 4, 3, 4, 3, 3, 3, 4, 3, 3, 3, 3, 3, 4, 3, 4, 3, 3, 3, 3, 3, 4, 3, 3, 3, 4, 3, 4, 3, 3, 3, 4, 3, 3, 3, 3, 3, 4, 3, 3, 3, 3, 3, 4, 3, 4, 3, 3, 3, 3, 3, 4, 3, 3, 3, 4, 3, 4, 3, 3, 3, 3, 3, 4, 3, 3, 3, 4, 3, 3, 3, 3, 3, 4, 3, 3, 3, 3, 3, 3, 3, 4, 3, 3, 3, 4, 3, 4, 3, 3, 3, 4 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,1

COMMENTS

Conjecture: a(n) = 4 for all prime numbers >= 3 and 3 for all composites

Third column of triangle in A081532. - N. J. A. Sloane, Oct 12 2010.

LINKS

Antti Karttunen, Table of n, a(n) for n = 3..2000 (computed from the b-file of A005179 provided by Don Reble)

FORMULA

a(n) = A292269(A005179(n)) for n >= 3. - Antti Karttunen, Oct 04 2017

EXAMPLE

a(4) = 3 because the divisors of 6 are 1, 2, 3, 6.

CROSSREFS

Cf. A081532, A171784. - N. J. A. Sloane, Oct 12 2010.

Cf. A005179, A292269.

Sequence in context: A108171 A231475 A106055 * A251767 A168309 A103947

Adjacent sequences:  A171780 A171781 A171782 * A171784 A171785 A171786

KEYWORD

nonn

AUTHOR

J. Lowell, Oct 12 2010

EXTENSIONS

More terms from R. J. Mathar, Oct 13 2010

STATUS

approved

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Last modified March 18 22:11 EDT 2019. Contains 321305 sequences. (Running on oeis4.)