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

Author

Tanya Khovanova, Oct 27 2006

Keywords

• nonn

Examples

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

Links

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

Crossrefs

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

Formula

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

Extensions

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