A374501 - OEIS

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A374501

Pentagonal pyramidal numbers that are products of smaller pentagonal pyramidal numbers.

1, 56448, 127008, 259200, 5644800, 31840200, 42688800, 60766200, 116493300, 130662720, 193179168, 442828800, 499000500, 897544800, 917632800, 3624409800, 6914880000, 13831171200, 15410656800, 31246000128, 53936416800, 64024732800, 72945774720, 88957620000

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

OFFSET

1,2

LINKS

Table of n, a(n) for n=1..24.

EXAMPLE

1 is a term because it is a pentagonal pyramidal number and equals the empty product.

56448 is a term because it is a pentagonal pyramidal number and equals the product of the pentagonal pyramidal numbers 196 and 288.

127008 is a term because it is a pentagonal pyramidal number and equals the product of the pentagonal pyramidal numbers 6, 6, 18, and 196.

CROSSREFS

Row n=5 of A374498.

Cf. A002411, A374500, A374502.