1248168421

This number is a prime.

Just showing those entries submitted by 'Leonardis': (Click here to show all)

+ The first term of the non-palindromic elements of the sequence 1, 121, 12421, 1248421, 1248168421, 12481632168421, ... (Where the k-th number is the concatenation of 2^0, 2^1, ... , 2^(k-1), 2^k, 2^(k-1), ... , 2^1, 2^0) is a prime number. [Leonardis]

Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell