OFFSET
1,2
COMMENTS
a(n) > 10^13 for n from 20 to 22. a(23) = 585927201062. [From Donovan Johnson, Jul 30 2010]
LINKS
Eric Weisstein's World of Mathematics, Cubic number.
EXAMPLE
a(3)=7 since 7,8,9 all have d = 1 but d(6) and d(10) != 1 and this is the first run of 3.
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
EXTENSIONS
More terms from Naohiro Nomoto, Jul 13 2001
a(16)-a(19) from Donovan Johnson, Jul 30 2010
STATUS
approved