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A114996 a(n) = smallest palindrome > a(n-1) (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 (list; graph; refs; listen; history; text; internal format)
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
Cf. A002113.
Sequence in context: A264696 A166122 A366405 * A153256 A137077 A046965
KEYWORD
base,sign
AUTHOR
Giovanni Teofilatto, Feb 23 2006
EXTENSIONS
Edited, corrected and extended by Klaus Brockhaus, Mar 13 2006
a(16) and a(19) corrected, a(21) and a(22) added by Klaus Brockhaus, May 23 2007
STATUS
approved

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Last modified May 26 10:56 EDT 2024. Contains 372824 sequences. (Running on oeis4.)