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

Author

Tanya Khovanova, Sep 22 2009

Keywords

• base
• nonn

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

• Tanya Khovanova, Papaya Words and Numbers

Crossrefs

Cf. A165135, A165136, A165137, A165610.

Formula

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

Extensions

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