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Search: id:A104585
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| A104585 |
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Pentagonal wave sequence of the second kind. |
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+0
3
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| 0, 2, 5, 15, 22, 40, 51, 77, 92, 126, 145, 187, 210, 260, 287, 345, 376, 442, 477, 551
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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A104584, pentagonal wave sequence of the first kind; switches odd and even applications and visa versa in A104585. The pentagonal wave triangle, A104586, has A104584 in odd columns and A104585 in even columns.
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FORMULA
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Even index terms are pentagonal numbers with even index in A000326. Odd index terms are second pentagonal numbers with odd index in A005449.
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EXAMPLE
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a(5) = 40 = A005449(5), a second pentagonal number.
a(6) = 51 = A000326(6) a pentagonal number.
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CROSSREFS
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Cf. A000326, A005449, A049452, A033570, A049453, A033568, A104586.
Sequence in context: A146121 A066883 A146120 this_sequence A146119 A116053 A146118
Adjacent sequences: A104582 A104583 A104584 this_sequence A104586 A104587 A104588
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KEYWORD
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nonn
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AUTHOR
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Gary W. Adamson (qntmpkt(AT)yahoo.com), Mar 17 2005
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