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, 83793300096830, 395732828592408

Offset: 1

Author

Donovan Johnson, Mar 06 2008

Keywords

• nonn
• more

Comments

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

a(10) > 2 * 10^15. - Toshitaka Suzuki, Jun 23 2025

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. A087977, A087978, A138207.

Cf. A154573. [Donovan Johnson, Jan 15 2009]

Extensions

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

a(8) from Toshitaka Suzuki, Apr 06 2025

a(9) from Toshitaka Suzuki, Jun 23 2025