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Search: id:A056153
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| A056153 |
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Leading least prime signatures: a(n) is in A025487 but a(n)/2 is not. |
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+0
3
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| 1, 6, 30, 36, 180, 210, 216, 900, 1080, 1260, 1296, 2310, 5400, 6300, 6480, 7560, 7776, 13860, 27000, 30030, 32400, 37800, 38880, 44100, 45360, 46656, 69300, 83160, 162000, 180180, 189000, 194400, 226800, 233280, 264600, 272160, 279936
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Values of A025487 can be mapped to the numeric partitions. In a similar way, values of a(n) can be mapped to the cyclic partitions by noting that the factorization vector begins (k, k, ...). E.g. 1260 = 2*2*3*3*5*7 yielding the vector (2,2,1,1).
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EXAMPLE
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a(3) = 36 because 36 is a member of A025487 but 36/2 = 18 is not. 2520 is a member of A025487 as is 2520/2 = 1260, so 2520 is not in a(n).
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CROSSREFS
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Cf. A025487, A062515.
Sequence in context: A066197 A078638 A068510 this_sequence A062515 A062268 A067879
Adjacent sequences: A056150 A056151 A056152 this_sequence A056154 A056155 A056156
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KEYWORD
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nonn
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AUTHOR
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Alford Arnold (Alford1940(AT)Aol.com), Jul 30 2000
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