18111

Appears in sequences

• Numbers n such that 243*2^n-1 is prime.at n=41A050880
• Near-repunit semiprimes.at n=32A105993
• Numbers k such that k and k^2 use only the digits 0, 1, 2, 3 and 8.at n=28A136814
• Numbers consisting of ones and eights.at n=38A213084
• Expansion of 1/((1-2*x)*(1+3*x)*(1-4*x)).at n=7A249994
• a(n) is the smallest composite number obtained by appending one or more 1's to n.at n=17A358154