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%I #9 Aug 15 2015 13:11:52
%S 2,4,7,20,57,149,523,1835,6810,26222,106670,444085
%N Number of Ruth-Aaron numbers (with multiplicity) less than 10^n.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/Ruth-AaronPair.html">Ruth-Aaron Pair</a>
%Y Cf. A039752.
%K nonn,more
%O 1,1
%A _Eric W. Weisstein_, Dec 16 2004
%E Offset corrected and a(9)-a(12) from _Donovan Johnson_, Dec 14 2010
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