1199999

Properties

Appears in sequences

• Primes that contain digits 1 and 9 only.at n=33A020457
• a(n) = smallest prime q of form q=-1+(p+1)*10^w, where p is n-th prime, or 0 if there is no such prime.at n=4A055785
• a(n) is the smallest number k such that the letter "N" appears n times when k is written in English.at n=15A060227
• Minimum number k for which the digital sum of k*n is 11*n.at n=5A147831
• Primes of the form identical digits preceded by an 11.at n=4A201966
• Square array read by antidiagonals upwards: M(n,k) is the initial occurrence of first prime p1 of consecutive primes p1, p2, where p2 - p1 = 2*k, and p1, p2 span a multiple of 10^n, n>=1, k>=1.at n=31A287050
• Expansion of x*(1 + 2*x*(5 - 4*x)*(1 + x^2)*(1 + x^4))/((1 - x)*(1 - 10*x^9)).at n=47A302556
• a(n) is the smallest positive number m not yet in the sequence with the property that the sum of the even digits of m and the sum of the odd digits of m differ by n.at n=47A341011
• Smallest prime obtained by appending one or more 9's to n, -1 if no such prime exists.at n=10A373859
• Prime numbersat n=92938