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A225066 Least hexagonal number that is the product of n hexagonal numbers greater than 1. 7
6, 2850, 79800, 2162160, 134734320, 15518903400, 174626020800, 19794628854000, 659394533191680, 659394533191680, 659394533191680, 38022361747469489295360 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..12.

Lars Blomberg, Table of n, a(n) with solutions for n=1..12

EXAMPLE

Let hex(n) = n*(2n-1). Then

a(1) = 6 = hex(2).

a(2) = 2850 = hex(38) = hex(3) * hex(10).

a(3) = 79800 = hex(200) = hex(3) * hex(4) * hex(10).

a(4) = 2162160 = hex(1040) = hex(2)^2 * hex(4) * hex(33).

a(5) = 134734320 = hex(8208) = hex(2)^2 * hex(3) * hex(4) * hex(67).

a(6) = 15518903400 = hex(88088) = hex(2) * hex(3) * hex(6)^2 * hex(7) * hex(15).

CROSSREFS

Cf. A000384 (hexagonal numbers).

Cf. A212616, A212617, A225066-A225070 (3-, 5- to 10-gonal cases).

Sequence in context: A097871 A210004 A198667 * A001326 A300851 A089501

Adjacent sequences:  A225063 A225064 A225065 * A225067 A225068 A225069

KEYWORD

nonn,more

AUTHOR

T. D. Noe, May 01 2013

EXTENSIONS

Corrected a(6) and added a(7)-a(12) by Lars Blomberg, Sep 21 2013

STATUS

approved

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Last modified October 14 07:19 EDT 2019. Contains 327995 sequences. (Running on oeis4.)