OFFSET
1,2
EXAMPLE
1 is a term because it is a square pyramidal number and equals the empty product.
4900 is a term because it is a square pyramidal number and equals the product of the square pyramidal numbers 5, 5, 14, and 14.
513590 is a term because it is a square pyramidal number and equals the product of the square pyramidal numbers 506 and 1015.
Further examples:
333833500 = 506*650*1015,
711410700 = 5*385*369564,
1042716675 = 55*91*208335,
1429018500 = 285*650*7714,
26088481055 = 91*8555*33511,
62366724420 = 30*3311*627874,
5223660842400 = 140*12529*2978040,
18289944673000 = 56980*320988850.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Pontus von Brömssen, Jul 09 2024
STATUS
approved