111111211111domain: NAppears in sequencesSmallest n-digit prime containing only digits 1 or 2 or -1 if no such prime exists.at n=11A036229Primes with digital product = 2.at n=10A107612Over the alphabet {1,2} let A=111, B=211; sequence lists words A, B, AA, AB, BA, BB, AAA, AAB, ...at n=17A291797