133333333

Appears in sequences

• Number of Fibonacci numbers F(k), k <= 10^n, which end in 9.at n=8A073556
• Expansion of g.f. (1+2*x)/((1-x)*(1-10*x)).at n=8A097166
• a(n) = Sum_{k=0..n} C(floor((n+1)/2),floor((k+1)/2)) * 3^k.at n=16A097169
• Numbers k such that the k-th triangular number contains only digits {1,8,9}.at n=19A119151
• a(n) = A133195(n)/3.at n=25A133201
• Mersenne primes written in base 4.at n=5A161677