

A358540


a(n) is the smallest number with exactly n divisors that are ngonal pyramidal numbers.


3



56, 140, 1440, 11550, 351120, 41580, 742560, 29279250, 8316000, 72348396120, 3386892600, 578918340
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OFFSET

3,1


COMMENTS

Any subsequent terms are > 2 * 10^9.  Lucas A. Brown, Dec 24 2022


LINKS

Table of n, a(n) for n=3..14.
Lucas A. Brown, Python program.
Eric Weisstein's World of Mathematics, Pyramidal Number
Index entries for sequences related to divisors of numbers


EXAMPLE

a(5) = 1440 because 1440 has 5 pentagonal pyramidal divisors {1, 6, 18, 40, 288} and this is the smallest such number.


CROSSREFS

Cf. A005179, A358539, A358541, A358542, A358543.
Sequence in context: A044688 A241287 A201096 * A358860 A226128 A038850
Adjacent sequences: A358536 A358538 A358539 * A358541 A358542 A358543


KEYWORD

nonn,more


AUTHOR

Ilya Gutkovskiy, Nov 21 2022


EXTENSIONS

a(11)a(13) from Martin Ehrenstein, Dec 02 2022
a(14) from Lucas A. Brown, Dec 19 2022


STATUS

approved



