A101805 Number of Ruth-Aaron numbers (with multiplicity) less than 10^n.

2, 4, 7, 20, 57, 149, 523, 1835, 6810, 26222, 106670, 444085

Offset: 1

Author

Eric W. Weisstein, Dec 16 2004

Keywords

• nonn
• more

Links

• Eric Weisstein's World of Mathematics, Ruth-Aaron Pair

Crossrefs

Cf. A039752.

Extensions

Offset corrected and a(9)-a(12) from Donovan Johnson, Dec 14 2010