A110755 a(n) = Tau(N), where N = the number obtained as a concatenation of 9801 with itself n times. Tau(n) = number of divisors of n.

15, 60, 288, 240, 480, 2304, 960, 7680, 5376, 7680, 5120, 18432, 1920, 15360, 2359296, 122880, 3840, 344064, 240, 122880, 7077888, 81920, 3840, 9437184, 491520, 30720, 786432, 491520, 30720, 150994944, 960, 983040, 12582912, 61440

Offset: 1

Author

Amarnath Murthy, Aug 11 2005

Keywords

• base
• nonn

Comments

9801, has the property that any number of concatenation of it with self and the digit reversal have same prime divisors.

Examples

			a(2) =tau(98019801) = 60.
		

Crossrefs

Cf. A110751, A110752, A110753, A110754.

Extensions

More terms from Alexis Olson (AlexisOlson(AT)gmail.com), Nov 14 2008

More terms from David Wasserman, Dec 18 2008