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A138206 a(n) is the first term in a chain of at least n consecutive numbers each with exactly 6 distinct prime factors. 6
30030, 11243154, 323567034, 7933641735, 45212320502, 626804494291, 7563009743844 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
a(8) > 10^13. [Donovan Johnson, Jan 15 2009]
LINKS
Roger B. Eggleton and James A. MacDougall, Consecutive integers with equally many principal divisors, Math. Mag. 81 (2008), 235-248. [T. D. Noe, Oct 13 2008]
CROSSREFS
Cf. A154573. [Donovan Johnson, Jan 15 2009]
Sequence in context: A072940 A147573 A046324 * A031853 A066576 A104877
KEYWORD
nonn,more
AUTHOR
Donovan Johnson, Mar 06 2008
EXTENSIONS
a(6)-a(7) from Donovan Johnson, Jan 15 2009
STATUS
approved

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Last modified March 19 01:34 EDT 2024. Contains 370952 sequences. (Running on oeis4.)