3125587domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes p such that p == i mod d(i) where d(i) are the prime divisors of 2p+1.at n=36A281317a(n) is the least prime of the form (3^r*5^s*7^t - 1)/2, r, s, t > 0, r + s + t = n.at n=7A337427Prime numbersat n=225210