A180327 The non-common part of the larger number of an amicable pair.

71, 605, 731, 1391, 796, 1357, 139, 1151, 827, 4187, 527, 107, 8873, 2759, 239, 7697, 19147, 16873, 11021, 11303, 25429, 4601, 91271, 97481, 30743, 49949, 28459, 4961, 32171, 899, 83711, 85759, 86407, 89027, 81583, 195889, 99587, 8227, 56339, 122623

Offset: 1

Author

T. D. Noe, Sep 07 2010

Keywords

• nonn

Comments

Very few duplicates occur: for the amicable numbers less than 10^14, a number appears at most twice.

Links

• T. D. Noe, Table of n, a(n) for n=1..10000

Crossrefs

Cf. A180326 (non-common part of the smaller number of an amicable pair)

Formula

a(n) = A002046(n) / gcd(A002025(n),A002046(n)) = A002046(n) / A061469(n).