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

1,1

Comments

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

Links

Table of n, a(n) for n=1..34.

Example

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

Crossrefs

Cf. A110751, A110752, A110753, A110754.

Sequence in context: A064761 A005945 A223337 * A206231 A001756 A284096

Adjacent sequences: A110752 A110753 A110754 * A110756 A110757 A110758

Keyword

base,nonn

Author

Amarnath Murthy, Aug 11 2005

Extensions

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

More terms from David Wasserman, Dec 18 2008

Status

approved