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A008602
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Multiples of 20.
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7
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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, 820, 840, 860, 880, 900, 920, 940, 960, 980, 1000
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| 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
| Tanya Khovanova, Recursive Sequences
INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 332
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MATHEMATICA
| Range[0, 1500, 20] (* From Vladimir Joseph Stephan Orlovsky (4vladimir(AT)gmail.com), June 01 2011 *)
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CROSSREFS
| Cf. A008600, A008601.
Sequence in context: A104153 A049057 A065607 * A061830 A041790 A041788
Adjacent sequences: A008599 A008600 A008601 * A008603 A008604 A008605
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KEYWORD
| nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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