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Search: id:A137507
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| A137507 |
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100^[n/10] + 2*n*10^[n/10]: inspired by Engel expansion of Pi. |
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+0
1
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| 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 300, 320, 340, 360, 380, 400, 420, 440, 460, 480, 14000, 14200, 14400, 14600, 14800, 15000, 15200, 15400, 15600, 15800, 1060000, 1062000, 1064000, 1066000, 1068000, 1070000
(list; graph; listen)
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OFFSET
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0,2
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PROGRAM
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(PARI) a(n) = (n+5 + 10^(floor((n+5)/10)))^2 - (n+5)^2; for (n=1, 30, print1(" "a(n)" ")) \\ changed n+5 to n. - M. F. Hasler, May 02 2008
(PARI) vector(30, n, n--; 2*n*10^(n\10) + 100^(n\10)) \\ - M. F. Hasler, May 02 2008
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CROSSREFS
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Cf. A006784.
Adjacent sequences: A137504 A137505 A137506 this_sequence A137508 A137509 A137510
Sequence in context: A143451 A014261 A066640 this_sequence A061808 A143450 A005842
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KEYWORD
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nonn
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AUTHOR
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Alexander R. Povolotsky (pevnev(AT)juno.com), Apr 23 2008
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EXTENSIONS
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Edited by M. F. Hasler (www.univ-ag.fr/~mhasler) and N. J. A. Sloane (njas(AT)research.att.com), May 02 2008
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