OFFSET
1,1
COMMENTS
Smallest k so that 2^(n-1) < k <= 2^n and A000005(k)^3 > k.
EXAMPLE
For n=7, 64 < a(7) = 66 < 128, A000005(66)^3 = 8^3 = 512 > 66, and no other such number occurs between 64 and 66.
For n=31, a(31) = 1074427200, 2^30 < a(31) < 2^31; a(31) has 1344 divisors and 1344^3 = 2427715584 > 1074427200. Between 2^30 and a(31) no other numbers occur with this property.
CROSSREFS
KEYWORD
nonn,fini,full
AUTHOR
Labos Elemer, Aug 16 2000
EXTENSIONS
a(33)-a(35) from Amiram Eldar, Aug 15 2024
STATUS
approved