login
A077516
Largest n-digit number beginning with n and having n divisors, or 0 if no such number exists.
1
1, 29, 361, 4997, 0, 699964, 0, 89999995, 999887641, 1099999504, 0, 129999999988, 0, 14999999996224, 159999933195664, 1699999999999998, 0, 189999999999999477, 0, 20999999999999999817, 219999996968515384384, 2299999999999999765504, 0, 249999999999999999999988
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
Cf. A077515.
Sequence in context: A239743 A022689 A234810 * A142278 A281059 A010834
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