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Search: id:A102861
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| A102861 |
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Numbers which in base 5 have digit-sum 4. |
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+0
1
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| 4, 8, 12, 16, 20, 28, 32, 36, 40, 52, 56, 60, 76, 80, 100, 128, 132, 136, 140, 152, 156, 160, 176, 180, 200, 252, 256, 260, 276, 280, 300, 376, 380, 400, 500, 628, 632, 636, 640, 652, 656, 660, 676, 680, 700, 752, 756, 760, 776, 780, 800, 876, 880, 900, 1000
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Or, sums of four powers of 5.
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FORMULA
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The author would like a formula for the n-th term.
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EXAMPLE
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In base 5 the numbers are 4, 13, 31, 40, 103, 112, 121, 130, 202, 211, 220, 301, 310, 400, 1003, ...
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MAPLE
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for n from 0 to 2500 do if coeff(series(add(x^(5^i), i=0..4)^4, x, 2500), x, n)<>0 then printf(`%d, `, n); fi:od:
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CROSSREFS
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Cf. A055235.
Sequence in context: A059532 A034045 A109238 this_sequence A004976 A071385 A066192
Adjacent sequences: A102858 A102859 A102860 this_sequence A102862 A102863 A102864
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KEYWORD
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nonn,base,easy
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AUTHOR
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Sergi Adamchuk (adamchuk(AT)gmail.com), Mar 15 2005
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EXTENSIONS
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More terms from Joshua Zucker (joshua.zucker(AT)stanfordalumni.org), May 15 2006
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