940141domain: NAppears in sequencesNumbers n such that both n and prime(n) consist of square digits (0,1,4,9).at n=13A107613Least squarefree integer m > 1 such that the product of all those (p + 4)/(p + 2) (with p a prime divisor of m) equals (2*n + 1)/(2*n - 1).at n=13A375351