

A138206


a(n) is the first term in a chain of at least n consecutive numbers each with exactly 6 distinct prime factors.


4




OFFSET

1,1


COMMENTS

a(8) > 10^13. [Donovan Johnson, Jan 15 2009]


LINKS

Table of n, a(n) for n=1..7.
Roger B. Eggleton and James A. MacDougall, Consecutive integers with equally many principal divisors, Math. Mag. 81 (2008), 235248. [T. D. Noe, Oct 13 2008]


CROSSREFS

Cf. A087977, A087978, A138207.
Cf. A154573. [Donovan Johnson, Jan 15 2009]
Sequence in context: A072940 A147573 A046324 * A031853 A066576 A104877
Adjacent sequences: A138203 A138204 A138205 * A138207 A138208 A138209


KEYWORD

nonn,more


AUTHOR

Donovan Johnson, Mar 06 2008


EXTENSIONS

a(6)a(7) from Donovan Johnson, Jan 15 2009


STATUS

approved



