136523domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(n) = a(n-2) + a(n-3) + a(n-4) for n>3, a(0)=1, a(1)=a(2)=0, a(3)=2.at n=34A277253Primes equal to a centered heptagonal number plus 1.at n=31A285811Primes in A194627.at n=19A377791Prime numbersat n=12717