69939

Appears in sequences

• Numbers whose set of base-16 digits is {1,3}.at n=33A032923
• Numbers whose base-4 representation has exactly 9 runs.at n=20A043600
• Numbers n such that number of runs in the base 4 representation of n is congruent to 0 mod 9.at n=20A043858
• Numbers k such that number of runs in the base 4 representation of k is congruent to 9 mod 10.at n=20A043876
• a(n) = a(n-1) + 2*a(floor(n/2)) if n > 0, otherwise 1.at n=41A058039
• Number of irregular primes less than or equal to the 3^n-th prime.at n=10A105467
• a(n) = n*(1 + n)*(3 - 4*n + 4*n^2)/6.at n=17A213840
• Expansion of 1/(1 - Sum_{p prime, k>=1} x^(p^k)/(1 - x^(p^k))).at n=23A300672
• a(n) = Sum_{d|n} mu(n/d) * binomial(d,4).at n=37A346761
• Expansion of Sum_{k>0} x^(4*k)/(1+x^k)^5.at n=37A363618