98303

Appears in sequences

• A nonlinear recurrence.at n=48A003073
• Nearest integer to 24*(2^n - 1)/n.at n=15A003138
• a(n) = ceiling(24(2^n-1)/n).at n=15A003177
• a(0) = 1; a(n) = 3*2^n - 1, for n > 0.at n=15A052940
• a(2n) = 2*2^n - 1, a(2n+1) = 3*2^n - 1.at n=31A052955
• a(0) = 0; for n > 0, a(n) = 3*2^(n-1) - 1.at n=16A055010
• Smallest number x > 1 such that phi(x) + sigma(x) = k*d(x)^n, i.e., the left-hand side is divisible by the n-th power of the number of divisors.at n=7A055470
• Duplicate of A055010.at n=16A060153
• Position of A014486(n) in A075165, minus one.at n=36A075162
• Variation on Ulam numbers: a(1) = 1; a(2) = 2; for n>2, a(n) = smallest (n odd) or largest (n even) number > a(n-1) that is a unique sum of two distinct earlier terms.at n=31A081026
• a(0) = 1; for n > 0, a(n) = 3*2^(n-1) - 1.at n=16A083329
• Add 1, double, add 1, double, etc.at n=31A083416
• Duplicate of A055010.at n=16A086219
• a(n) = 3*2^floor((n-1)/2) + (-1)^n.at n=30A097581
• Expansion of g.f.: (3+x+2*x^2-2*x^3)/((1-2*x)*(1+x^2)).at n=15A100720
• Smallest semiprime with Hamming weight n (i.e., smallest semiprime with exactly n ones when written in binary), or -1 if no such number exists.at n=15A102029
• Position of A014486(n) in A106455, minus one.at n=36A106452
• Numbers that contain a single zero in bases 2 and 10.at n=31A118681
• Slater-Velez permutation sequence of the 2nd kind.at n=30A129198
• a(n) = 6*4^n - 1.at n=7A140529