1,1

Corresponding primes p are listed in A121877[n] = Prime[A123704[n]] = {13, 19, 23, 31, 47, 127, 223, 281, 2083, ...} Numbers n such that (5^n-3^n)/2 is a prime. Numbers n such that (5^p-3^p)/2 is prime, where p = Prime[n], are listed in A123704[n] = {6, 8, 9, 11, 15, 31, 48, 60, 314, ...}.

Cf. A123704, A121877.

Adjacent sequences: A123702 A123703 A123704 this_sequence A123706 A123707 A123708

Sequence in context: A032755 A057535 A134858 this_sequence A018786 A003824 A105382

nonn

Alexander Adamchuk (alex(AT)kolmogorov.com), Oct 08 2006