A122967 Greatest prime factor of the pair of amicable numbers. Amicable numbers are sorted by the smaller number in the pair.

71, 37, 131, 251, 199, 79, 139, 1151, 827, 89, 71, 107, 467, 89, 239, 239, 467, 359, 467, 479, 431, 263, 853, 2267, 433, 251, 1439, 2393, 1367, 47, 863, 449, 1217, 701, 4799, 89, 1879, 433, 1063, 2609, 269, 5669, 239, 2099, 6803, 251, 3923, 199, 929, 227, 5119

Offset

1,1

Links

Amiram Eldar, Table of n, a(n) for n = 1..10000 (terms 1..1000 from T. D. Noe)

Formula

a(n) = max(A006530(A002025(n)), A006530(A002046(n))). - R. J. Mathar, Nov 10 2006

Example

220 = 2^2*5*11, 284 = 2^2*71. The greatest prime factor in the pair is 71.

Crossrefs

Cf. A002025, A002046, A006530, A063990 (amicable numbers), A061469 (GCD of the amicable pairs).

Sequence in context: A350007 A128856 A033391 * A087075 A095936 A104843

Adjacent sequences: A122964 A122965 A122966 * A122968 A122969 A122970

Keyword

nonn

Author

Tanya Khovanova, Oct 27 2006

Extensions

More terms from R. J. Mathar, Nov 10 2006

Status

approved