1,1

These numbers are called Caesar primes because the birth date of Julius Caesar (July 13th) provides one example of such a number, i.e. p=7 and q=13 give the prime 13*10+7=137.

Table of n, a(n) for n=1..26.

Sequence in context: A045807 A007644 A136073 * A057667 A160041 A013538

Adjacent sequences: A133184 A133185 A133186 * A133188 A133189 A133190

nonn

Tom Mueller (muel4503(AT)uni-trier.de), Dec 17 2007

approved