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Search: id:A008602
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| 0, 20, 40, 60, 80, 100, 120, 140, 160, 180, 200, 220, 240, 260, 280, 300, 320, 340, 360, 380, 400, 420, 440, 460, 480, 500, 520, 540, 560, 580, 600, 620, 640, 660, 680, 700, 720, 740, 760, 780, 800
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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The multiples of 20 are exactly those integers which do not have a multiple whose decimal digits are of alternating parity. (International Mathematical Olympiad 2004, problem 6.) - Joseph Myers (jsm(AT)polyomino.org.uk), Jul 13 2004
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LINKS
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Tanya Khovanova, Recursive Sequences
INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 332
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MAPLE
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with(finance):seq(add(cashflows([5, 5, 10], 0 ), k=1..n), n=0..40); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 30 2008
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PROGRAM
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(Other) sage: [i for i in range(820) if gcd(i, 20) == 20] # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), May 20 2009]
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CROSSREFS
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Sequence in context: A104153 A049057 A065607 this_sequence A061830 A041790 A041788
Adjacent sequences: A008599 A008600 A008601 this_sequence A008603 A008604 A008605
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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