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

1,1

Links

Table of n, a(n) for n=1..12.

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

Crossrefs

Cf. A039752.

Sequence in context: A247234 A327444 A291403 * A145777 A188497 A237759

Adjacent sequences: A101802 A101803 A101804 * A101806 A101807 A101808

Keyword

nonn,more

Author

Eric W. Weisstein, Dec 16 2004

Extensions

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

Status

approved