A165611 The number of n-digit non-papaya numbers.

0, 0, 648, 7128, 85536, 870750, 8937054, 89606088, 899190558, 8995054860, 89990100090, 899940633714, 8999883000108, 89999307063540, 899998650010008, 8999992080398088, 89999984700000144, 899999910900869040, 8999999829000000162, 89999999010004961988

Offset

1,3

Comments

These are numbers that are neither palindromes nor concatenations of two palindromes. Three digit numbers that are non-papaya are numbers with all distinct digits. There are 9*9*8 of them: 648.

Links

Table of n, a(n) for n=1..20.

Tanya Khovanova, Papaya Words and Numbers

Formula

a(n) = A052268(n) - A165135(n).

Crossrefs

Cf. A165135, A165136, A165137, A165610.

Sequence in context: A204392 A233677 A200938 * A282334 A034619 A185270

Adjacent sequences: A165608 A165609 A165610 * A165612 A165613 A165614

Keyword

base,nonn

Author

Tanya Khovanova, Sep 22 2009

Extensions

a(6)-a(20) from Andrew Howroyd, Mar 29 2016

Status

approved