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Search: id:A019273
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| A019273 |
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First run of n consecutive integers with same number of divisors ends at a(n). |
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+0
7
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| 1, 3, 35, 245, 11609, 28379, 171899, 1043710445728, 2197379769828
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Terminating number in the sequence of consecutive integers with the same number of divisors in A006558. - Jud McCranie (j.mccranie(AT)comcast.net), Jan 14 2006
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REFERENCES
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R. K. Guy "Unsolved Problems in Number Theory", section B18.
David Wells "Dictionary of Curious and Interesting Numbers" #40311.
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EXAMPLE
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phi(33)=phi(34)=phi(35), so a(3)=35
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CROSSREFS
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Cf. A000005, A005237, A005238, A006601, A049051, A006558, A039665.
a(n)=A006558(n)+n-1.
Sequence in context: A133710 A130061 A061548 this_sequence A069448 A121078 A112488
Adjacent sequences: A019270 A019271 A019272 this_sequence A019274 A019275 A019276
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KEYWORD
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nonn
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AUTHOR
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j.mccranie(AT)comcast.net (JUD MCCRANIE)
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EXTENSIONS
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The entry 40315 given in Guy and Wells is incorrect.
More terms from Jud McCranie (JudMcCr(AT)BellSouth.net), Oct 04 2002
One more term from Jud McCranie (j.mccranie(AT)comcast.net), Jan 14 2006
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