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Search: id:A097251
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| A097251 |
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Numbers whose set of base 5 digits is {0,4}. |
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+0
13
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| 0, 4, 20, 24, 100, 104, 120, 124, 500, 504, 520, 524, 600, 604, 620, 624, 2500, 2504, 2520, 2524, 2600, 2604, 2620, 2624, 3000, 3004, 3020, 3024, 3100, 3104, 3120, 3124, 12500, 12504, 12520, 12524, 12600, 12604, 12620, 12624, 13000, 13004, 13020
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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n such that there exists a permutation p_1, ..., p_n of 1, ..., n such that i + p_i is a power of 5 for every i.
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FORMULA
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a(n) = 4*A033042(n).
a(2n) = 5*a(n), a(2n+1) = a(2n)+4.
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CROSSREFS
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Cf. A001196, A005823, A097252-A097262.
Sequence in context: A065984 A039569 A032425 this_sequence A079454 A115428 A043880
Adjacent sequences: A097248 A097249 A097250 this_sequence A097252 A097253 A097254
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KEYWORD
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nonn,base
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AUTHOR
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Ray Chandler (rayjchandler(AT)sbcglobal.net), Aug 3 2004
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