Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 5000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".
Table of n, a(n) for n=1..45.
a(5)=199 since 1^2+9^2+9^2=1+81+81=163 is a prime and reverse(199)=911 has the same property.
Sequence in context: A131648 A180441 A180421 * A163760 A179911 A187867
Adjacent sequences: A180404 A180405 A180406 * A180408 A180409 A180410
Carmine Suriano, Sep 02 2010