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A115997
Numbers k such that the concatenation of k with the k-th prime gives a palindrome.
1
7, 16638, 3631421, 141521639, 3087218304
OFFSET
1,1
EXAMPLE
prime(3087218304)=74038127803 and 308721830474038127803 is a palindrome.
CROSSREFS
Sequence in context: A203685 A134645 A327840 * A013786 A351326 A285178
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, Feb 13 2006
STATUS
approved