

A114996


a(n) = smallest palindrome > a(n1) (for n > 0) such that the sum of its prime digits is equal to palindrome with index n, or 1 if none exists.


0



0, 1, 2, 3, 22, 151, 222, 232, 323, 333, 353, 37273, 77577, 7772777, 377777773, 5777777775, 77777777777, 27777777777772, 577777757777775, 577777777777775, 37777777777777773, 2777777775777777772, 7777777775777777777
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OFFSET

0,3


COMMENTS

Palindrome with index n is A002113(n).


LINKS



EXAMPLE

a(0) = 0 since A002113(0) = 0 and the prime digits of 0 sum to 0.
a(1) = 1 since A002113(1) = 1 and there is no number (all the more no palindrome) whose prime digits sum to 1.
a(5) = 151 since A002113(5) = 5 and 151 is the smallest palindrome > a(4) = 22 whose prime digits sum to 5.


CROSSREFS



KEYWORD

base,sign


AUTHOR



EXTENSIONS

a(16) and a(19) corrected, a(21) and a(22) added by Klaus Brockhaus, May 23 2007


STATUS

approved



