OFFSET
1,2
EXAMPLE
a(4) = 4989 = 3*1663 has 4 divisors: 1, 3, 1663 and 4989. a(5) = 0 as 13^4 = 28561 < 50000 < 59999 < 83521 = 17^4.
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Amarnath Murthy, Nov 08 2002
EXTENSIONS
Corrected and extended by Ray Chandler, Aug 15 2003
a(24) from Jon E. Schoenfield, Mar 17 2022
STATUS
approved