A138206 a(n) is the first term in a chain of at least n consecutive numbers each with exactly 6 distinct prime factors.

30030, 11243154, 323567034, 7933641735, 45212320502, 626804494291, 7563009743844

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), 235-248. [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