|
| |
|
|
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. [From Donovan Johnson (donovan.johnson(AT)yahoo.com), Jan 15 2009]
|
|
|
REFERENCES
| 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]
|
|
|
CROSSREFS
| Cf. A087977, A087978, A138207.
Cf. A154573 [From Donovan Johnson (donovan.johnson(AT)yahoo.com), Jan 15 2009]
Sequence in context: A072940 A147573 A046324 * A031853 A066576 A104877
Adjacent sequences: A138203 A138204 A138205 * A138207 A138208 A138209
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Donovan Johnson (donovan.johnson(AT)yahoo.com), Mar 06 2008
|
|
|
EXTENSIONS
| a(6)-a(7) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Jan 15 2009
|
| |
|
|
