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A101805
Number of Ruth-Aaron numbers (with multiplicity) less than 10^n.
1
2, 4, 7, 20, 57, 149, 523, 1835, 6810, 26222, 106670, 444085
(list; graph; refs; listen; history; text; internal format)
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

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Last modified October 3 20:31 EDT 2024. Contains 376491 sequences.
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