3486784402

Appears in sequences

• a(n) = sigma_20(n), the sum of the 20th powers of the divisors of n.at n=2A013968
• Numerator of sum of -20th powers of divisors of n.at n=2A017703
• a(n) = 3^n + 1.at n=20A034472
• Numbers whose cube is palindromic in base 9.at n=17A046241
• Expansion of g.f. (2-3*x-x^2)/((1-x^2)*(1-3*x)).at n=20A052929
• a(n) = 9^n + 1.at n=10A062396
• a(n) = 9^(2*n) + 1.at n=5A063270
• a(n) = n*9^n + 1.at n=9A064747
• Where records occur in A074078.at n=15A074098
• Numbers of the form (9^{mr}-1)/(9^r-1) for positive integers m, r.at n=24A076288
• a(n) = 3^n + (-1)^n - [1/(n+1)], where [] represents the floor function.at n=20A084182
• Expansion of (1- 2*x - x^2)/((1-x)*(1-3*x)).at n=21A094388
• a(n) = 3^n + (-1)^n.at n=20A102345
• a(n) = 3^n + 1 - 0^n.at n=20A103457
• a(n) = 9^n + 1 - 0^n.at n=10A103460
• a(n) = n^(n+1) + 1.at n=9A110567
• Duplicate of A110567.at n=9A123570
• a(n) = smallest number that leads to a new cycle under the base-9 Kaprekar map of A165110.at n=16A165127
• a(n) is the smallest number k > 1 such that k^n - 1 is divisible by 3^n.at n=20A316505
• a(n) = Sum_{d|n} 9^(d-1).at n=10A339689