Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 4500 articles have referenced us, often saying "we would not have discovered this result without the OEIS".
Table of n, a(n) for n=0..55.
(61,62) is such a pair, hence the name.
Corrected and extended by David W. Wilson
Cf. Ruth-Aaron numbers A006145, A039945.
Sequence in context: A189046 A098328 A062098 * A166637 A237686 A170918
Adjacent sequences: A045756 A045757 A045758 * A045760 A045761 A045762
Mike Keith (domnei(AT)aol.com)