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Search: id:A137425
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| A137425 |
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a(1) = 1;l for n>1, a(n) = smallest number such that: 1. the number of divisors is strictly increasing, 2. the differences between the terms are nondecreasing. |
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+0
1
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| 1, 2, 4, 6, 12, 24, 36, 48, 60, 120, 180, 240, 360, 720, 1080
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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840 with 32 divisors cannot be the term after 720 because 720 - 360 = 360 and 840 - 720 is 120 < 360. On the other hand, 1080 (also with 32 divisors) can because 720 - 360 = 360 and 1080 - 720 = 360 >= 360.
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CROSSREFS
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Adjacent sequences: A137422 A137423 A137424 this_sequence A137426 A137427 A137428
Sequence in context: A002182 A077006 A004394 this_sequence A141320 A134865 A140753
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KEYWORD
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more,nonn
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AUTHOR
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J. Lowell (jhbubby(AT)mindspring.com), Apr 17 2008
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