A115997 Numbers k such that the concatenation of k with the k-th prime gives a palindrome.

7, 16638, 3631421, 141521639, 3087218304

Offset

1,1

Links

Table of n, a(n) for n=1..5.

Example

prime(3087218304)=74038127803 and 308721830474038127803 is a palindrome.

Crossrefs

Cf. A109304, A115996.

Sequence in context: A203685 A134645 A327840 * A013786 A351326 A285178

Adjacent sequences: A115994 A115995 A115996 * A115998 A115999 A116000

Keyword

nonn,base

Author

Giovanni Resta, Feb 13 2006

Status

approved