A083664 - OEIS

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A083664

a(1) = 1, a(n) = if n mod 10 = 0 then n else smallest number m, not occurring earlier such that m*a(n-d) is a palindrome, where d = if n mod 10 = 1 then 2 else 1.

3

1, 2, 3, 11, 4, 22, 28, 9, 19, 10, 17, 16, 29, 8, 34, 88, 7, 23, 18, 20, 14, 31, 154, 13, 38, 231, 12, 21, 25, 30, 209, 42, 6, 37, 15, 35, 143, 49, 77, 40, 26, 33, 47, 303, 57, 333, 64, 66, 32, 50, 132, 48, 44, 53, 404, 58, 364, 111, 5, 60, 101, 55, 91, 99, 46, 437, 92, 236

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

Permutation of natural numbers: a(A083665(n))=A083665(a(n))=n;

for n>1: a(n)=n iff n == 0 modulo 10.

LINKS

Table of n, a(n) for n=1..68.

Index entries for sequences that are permutations of the natural numbers

CROSSREFS

Cf. A083666, A083125, A002113.

Sequence in context: A201267 A046641 A336876 * A083125 A332661 A031335

Adjacent sequences: A083661 A083662 A083663 * A083665 A083666 A083667

KEYWORD

nonn,base

AUTHOR

Reinhard Zumkeller, May 02 2003

STATUS

approved