

A113614


Least number whose absolute difference of successive digits gives the nth palindrome (A002113), or 0 if no such number exists.


0



121, 131, 141, 151, 161, 171, 181, 191, 0, 1001, 1012, 1021, 1032, 1043, 1054, 1065, 1076, 1087, 1098, 0
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OFFSET

10,1


COMMENTS

1. a(n) =0 if n begins with 9 and contains odd number of digit. e.g. 919,92129, etc. Are there other valus of n for which a(n) = 0? 2. If n contains begins with 9 as a digit and contains even number of digits then a(n) is a palindrome.


LINKS



EXAMPLE

a(99) = 909
a(191) = 1098. 1  0 = 1, 0 ~ 9 = 9, 9  8 = 1.
a(9119)= 90109.


CROSSREFS



KEYWORD

base,more,nonn,uned


AUTHOR



STATUS

approved



