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Find Friends of a Number
From OeisWiki
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.