18874367

Properties

Appears in sequences

• Primes of the form 9*2^n-1.at n=5A050524
• Expansion of (1+x^2-x^3)/((1-x)*(1-2*x)).at n=23A052996
• a(1) = 2, a(n+1) = smallest squarefree number == 1 (mod a(n)) and > a(n).at n=24A076698
• Smallest prime p with bigomega(p+1)=n, where bigomega(m)=A001222(m) is the number of prime divisors of m (counted with multiplicity).at n=22A118883
• a(n) = 9*8^n - 1.at n=7A198856
• Primes of the form 9n^3-1.at n=20A200960
• Primes of the form m = 8^i + 8^j - 1, where i > j >= 0.at n=7A239718
• Primes of the form 2^i * 3^j - 1 for positive i, j.at n=39A268640
• a(n) is the least prime of the form 2^j*3^k - 1, j > 0, k > 0, j + k = n. a(n) = 0 if no such prime exists.at n=21A337437
• Prime numbersat n=1203569