A341192 Number of ways to write n as an ordered sum of 3 nonzero decimal palindromes.

1, 3, 6, 10, 15, 21, 28, 36, 45, 52, 60, 66, 70, 72, 72, 70, 66, 60, 55, 45, 39, 34, 30, 27, 25, 24, 24, 24, 27, 27, 25, 27, 27, 27, 27, 27, 27, 27, 27, 30, 27, 27, 30, 30, 30, 30, 30, 30, 30, 30, 33, 27, 30, 33, 33, 33, 33, 33, 33, 33, 33, 36, 27, 34, 36, 36, 36, 36

Offset

3,2

Links

Alois P. Heinz, Table of n, a(n) for n = 3..20000

Mathematica

nmax = 70; CoefficientList[Series[Sum[Boole[PalindromeQ[k]] x^k, {k, 1, nmax}]^3, {x, 0, nmax}], x] // Drop[#, 3] &

Crossrefs

Cf. A002113, A136522, A261131, A261132, A261422, A341156, A341191, A341193.

Sequence in context: A037123 A062918 A113168 * A071817 A033442 A105335

Adjacent sequences: A341189 A341190 A341191 * A341193 A341194 A341195

Keyword

nonn,base

Author

Ilya Gutkovskiy, Feb 06 2021

Status

approved