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A165611 The number of n-digit non-papaya numbers. 4
0, 0, 648, 7128, 85536, 870750, 8937054, 89606088, 899190558, 8995054860, 89990100090, 899940633714, 8999883000108, 89999307063540, 899998650010008, 8999992080398088, 89999984700000144, 899999910900869040, 8999999829000000162, 89999999010004961988 (list; graph; refs; listen; history; text; internal format)
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

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Last modified December 8 03:17 EST 2021. Contains 349590 sequences. (Running on oeis4.)