Find Friends of a Number

Find Friends of a Number

"Every positive number was one of Ramanujan's personal friends"  - J. E. Littlewood

Enter a number: this page will try to find terms in the sequences in the
On-Line Encyclopedia of Integer Sequences
that have a large common factor (or gcd) with it.

First version written by Mark Owen, March 2005; rewritten by Russ Cox to use the new lookup programs, March 2006.