A083870 Number of pairs (x,y) of palindromes such that n-th decimal palindrome = x*y and 1<=x<=y.

1, 1, 1, 2, 1, 2, 1, 2, 2, 1, 2, 2, 3, 2, 4, 2, 4, 3, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, 2, 1, 3, 1, 2, 1, 2, 1, 2, 1, 1, 2, 1, 1, 3, 1, 1, 2, 3, 1, 2, 1, 3, 1, 2, 1, 5, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 4, 3, 2, 2, 2, 1, 4, 1, 2, 2, 2, 1, 1, 1, 1, 1, 1, 2, 1, 1, 4, 1, 2, 1, 3, 1, 2, 1, 4, 1, 3, 1, 1, 2, 1, 1, 2

Offset

1,4

Links

Table of n, a(n) for n=1..105.

Example

A002113(132)=3333 = 1*3333 = 3*1111 = 11*303 = 33*101, therefore
a(132)=4.

Crossrefs

Cf. A083867, A038548, A002113.

Sequence in context: A118458 A118459 A274354 * A368779 A052299 A071854

Adjacent sequences: A083867 A083868 A083869 * A083871 A083872 A083873

Keyword

nonn,base

Author

Reinhard Zumkeller, May 07 2003

Status

approved