86418domain: NAppears in sequencesa(n) is the least k such that (k*prime(n)#)^2 + 1, ((k+1)*prime(n)#)^2 + 1 and ((k+2)*prime(n)#)^2 + 1 are 3 primes, where prime(n)# is the n-th primorial.at n=43A098765Magic sums of 4 X 4 semimagic squares composed of consecutive primes.at n=36A270864a(n) = 680*2^n - 622.at n=7A305263