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Search: id:A138206
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| A138206 |
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a(n) is the first term in a chain of at least n consecutive numbers each with exactly 6 distinct prime factors. |
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+0
5
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| 30030, 11243154, 323567034, 7933641735, 45212320502, 626804494291, 7563009743844
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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a(8) > 10^13. [From Donovan Johnson (donovan.johnson(AT)yahoo.com), Jan 15 2009]
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REFERENCES
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Roger B. Eggleton and James A. MacDougall, Consecutive integers with equally many principal divisors, Math. Mag. 81 (2008), 235-248. [From T. D. Noe (noe(AT)sspectra.com), Oct 13 2008]
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CROSSREFS
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Cf. A087977, A087978, A138207.
Cf. A154573 [From Donovan Johnson (donovan.johnson(AT)yahoo.com), Jan 15 2009]
Sequence in context: A072940 A147573 A046324 this_sequence A031853 A066576 A104877
Adjacent sequences: A138203 A138204 A138205 this_sequence A138207 A138208 A138209
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KEYWORD
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nonn
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AUTHOR
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Donovan Johnson (donovan.johnson(AT)yahoo.com), Mar 06 2008
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EXTENSIONS
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a(6)-a(7) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Jan 15 2009
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