1162261468

Appears in sequences

• a(n) = sigma_19(n), the sum of the 19th powers of the divisors of n.at n=2A013967
• Numerator of sum of -19th powers of divisors of n.at n=2A017701
• a(n) = 3^n + 1.at n=19A034472
• Expansion of (1- 2*x - x^2)/((1-x)*(1-3*x)).at n=20A094388
• a(n) = 3^n + 1 - 0^n.at n=19A103457
• a(n) = 3^n - (-1)^n.at n=19A105723
• a(n) = 3*9^n + 1.at n=9A199561
• Expansion of 1/((1 - x) * ((1 - x)^3 + x^3)).at n=37A307395
• Square array A(n,k), n >= 1, k >= 0, read by antidiagonals, where A(n,k) is Sum_{d|n} d^(k*d+1).at n=38A308704
• a(n) is the smallest number k > 1 such that k^n - 1 is divisible by 3^n.at n=18A316505
• Image of n under the 3^x+1 map, which is a variation of the 3x+1 (Collatz) map.at n=18A336913