A083475 Consider the set of all the numbers n*k where 1 <= k <= n. Then a(n) = number of palindromic members of this set.

1, 2, 3, 2, 1, 1, 1, 1, 1, 0, 10, 0, 0, 0, 0, 0, 1, 1, 2, 0, 1, 6, 2, 0, 2, 2, 0, 2, 3, 0, 2, 0, 5, 2, 2, 2, 10, 2, 2, 0, 1, 1, 1, 4, 1, 2, 3, 1, 2, 0, 1, 1, 5, 0, 1, 1, 3, 4, 1, 0, 0, 2, 2, 1, 1, 6, 1, 2, 3, 0, 0, 0, 2, 6, 1, 0, 12, 2, 1, 0, 0, 1, 1, 2, 1, 0, 1, 9, 1, 0, 8, 1, 1, 1, 1, 4, 1, 1, 10, 0, 19, 0, 2, 1

Offset

1,2

Comments

a(10k) = 0.

Links

Table of n, a(n) for n=1..104.

Example

a(22) = 6 and the palindromes are 22,44,66,88,242,484.
a(26) = 2 and the palindromes are 494 and 676.

Crossrefs

Cf. A083476.

Sequence in context: A346399 A339071 A358478 * A211994 A122402 A179008

Adjacent sequences: A083472 A083473 A083474 * A083476 A083477 A083478

Keyword

base,nonn

Author

Amarnath Murthy and Meenakshi Srikanth (menakan_s(AT)yahoo.com), May 03 2003

Extensions

More terms from David Wasserman, Nov 15 2004

Status

approved