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A125687
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The base 6 numbers 4 44 444 4444 44444 ... converted to base 10.
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4, 28, 172, 1036, 6220, 37324, 223948, 1343692, 8062156, 48372940, 290237644, 1741425868, 10448555212, 62691331276, 376147987660, 2256887925964, 13541327555788, 81247965334732, 487487792008396, 2924926752050380
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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FORMULA
| a(n)=(6^n-1)*4/5.
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EXAMPLE
| Base 6.........decimal
4....................4
44..................28
444................172
4444..............1036
44444.............6220
444444...........37324
4444444.........223948
44444444.......1343692
444444444......8062156
4444444444....48372940
etc.............etc...
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MAPLE
| seq((6^n-1)*4/5, n=1..24);
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MATHEMATICA
| 4 (6^Range[20]-1)/5 (* From Harvey P. Dale, Mar 12 2011 *)
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CROSSREFS
| Sequence in context: A012847 A128721 A053524 * A026298 A001396 A155611
Adjacent sequences: A125684 A125685 A125686 * A125688 A125689 A125690
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KEYWORD
| easy,nonn
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AUTHOR
| Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jan 31 2007
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EXTENSIONS
| Edited by N. J. A. Sloane (njas(AT)research.att.com), Feb 02 2007
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