A063067 Numbers expressible as (a^2-1)(b^2-1) in at least 2 distinct ways (b>=a>1).

360, 504, 2304, 2520, 2880, 3465, 5040, 5400, 7920, 9360, 12285, 12600, 12672, 13440, 14400, 17325, 20160, 23040, 27720, 28224, 29400, 30600, 32760, 35640, 38080, 40320, 42840, 47880, 48384, 49920, 51480, 57960, 60480, 63360, 72072

Offset

1,1

Links

Donovan Johnson, Table of n, a(n) for n = 1..1000

K. S. Brown, Numbers Expressible as (a^2-1)(b^2-1)

Example

360 is on the list since 360 = (2^2-1)(11^2-1) = (4^2-1)(5^2-1).

Crossrefs

Cf. A057535, A063066, A063068.

Sequence in context: A072414 A375075 A163569 * A076205 A048978 A056502

Adjacent sequences: A063064 A063065 A063066 * A063068 A063069 A063070

Keyword

nonn

Author

Henry Bottomley, Jul 08 2001

Status

approved