991999999999
domain: N
Appears in sequences
- Smallest prime whose product of digits is 3^n.at n=22A088653
- Primes composed of digit {1,9} and with digit sum 9*k+1.at n=22A164890
- Smallest prime numbers p of length n having a decimal expansion x(1)x(2)... x(n) such that there exists an index j where x(j) = 1 and x(i) = 9 for i<>j, or 0 if no such prime exists.at n=10A241021