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Search: id:A080258
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| A080258 |
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Either 4-th power of a prime, or product of a prime and the square of a different prime. |
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+0
2
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| 12, 16, 18, 20, 28, 44, 45, 50, 52, 63, 68, 75, 76, 81, 92, 98, 99, 116, 117, 124, 147, 148, 153, 164, 171, 172, 175, 188, 207, 212, 236, 242, 244, 245, 261, 268
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Union of A030514 and A054753; A080256(a(n)) = 5.
Or, the numbers n such that 8=number of perfect partitions of n. [From Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Sep 26 2009]
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FORMULA
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A002033(a(n))=8. [From Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Sep 26 2009]
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EXAMPLE
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81=3*3*3*3 and 50=2*5*5 are a terms.
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CROSSREFS
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Cf. A007964, A058080, A001221, A001222, A002033, A006881, A030078.
Sequence in context: A058080 A119911 A064499 this_sequence A054290 A107308 A051518
Adjacent sequences: A080255 A080256 A080257 this_sequence A080259 A080260 A080261
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KEYWORD
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nonn
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AUTHOR
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Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Feb 10 2003
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