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A034051
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Numbers with multiplicative digital root value 4.
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14
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4, 14, 22, 27, 39, 41, 72, 89, 93, 98, 114, 122, 127, 139, 141, 172, 189, 193, 198, 212, 217, 221, 249, 266, 271, 277, 294, 319, 333, 338, 346, 364, 379, 383, 391, 397, 411, 429, 436, 463, 492, 626, 634, 643, 662, 677, 712, 721, 727, 739, 767, 772, 776, 793
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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LINKS
| Eric Weisstein's World of Mathematics, Multiplicative Digital Root
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FORMULA
| There are n(n+1)(n+2)/6 elements up to 10^n, so a(n) is about 10^sqrt(6n).
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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: A165721 A197638 A051806 * A199984 A044437 A199987
Adjacent sequences: A034048 A034049 A034050 * A034052 A034053 A034054
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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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