A115997 - OEIS

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A115997

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

%I #6 Jul 15 2021 06:33:28

%S 7,16638,3631421,141521639,3087218304

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

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

%Y Cf. A109304, A115996.

%K nonn,base

%O 1,1

%A _Giovanni Resta_, Feb 13 2006