120932353domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(n) = 2*6^n + 1.at n=10A199317Primes of the form 2*6^n+1.at n=5A205776a(n) is the least prime of the form 2^j*3^k + 1, j > 0, k > 0, j + k = n. a(n) = 0 if no such prime exists.at n=19A336773Prime numbersat n=6891633