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A034050
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Numbers with multiplicative digital root value 3.
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13
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3, 13, 31, 113, 131, 311, 1113, 1131, 1311, 3111, 11113, 11131, 11311, 13111, 31111, 111113, 111131, 111311, 113111, 131111, 311111, 1111113, 1111131, 1111311, 1113111, 1131111, 1311111, 3111111, 11111113, 11111131, 11111311, 11113111
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Numbers with one 3, and zero or more 1s. - Daniel Forgues, Oct 09 2011
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LINKS
| Eric Weisstein's World of Mathematics, Multiplicative Digital Root
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FORMULA
| There are n(n+1)/2 members up to 10^n, so a(n) is about 10^sqrt(2n).
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CROSSREFS
| Cf. A031347.
Cf. A034048, A002275, A034049, A034050, A034051, A034052, A034053, A034054, A034055, A034056 (numbers having multiplicative digital roots 0-9).
Sequence in context: A146842 A146191 A058264 * A107689 A154834 A159047
Adjacent sequences: A034047 A034048 A034049 * A034051 A034052 A034053
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KEYWORD
| nonn,base
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AUTHOR
| Patrick De Geest (pdg(AT)worldofnumbers.com), Sep 15 1998.
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