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

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.

Sequence in context: A234488 A348100 A184613 * A202433 A329270 A190836

Adjacent sequences: A374498 A374499 A374500 * A374502 A374503 A374504

Keyword

nonn

Author

Pontus von Brömssen, Jul 09 2024

Status

approved