387420490
domain: N
Appears in sequences
- a(n) = sigma_18(n), the sum of the 18th powers of the divisors of n.at n=2A013966
- Sierpiński numbers of the first kind: n^n + 1.at n=9A014566
- Numerator of sum of -18th powers of divisors of n.at n=2A017699
- a(n) = 3^n + 1.at n=18A034472
- Dirichlet convolution of b_n=1 with c_n=3^(n-1).at n=18A034730
- If decimal expansion of n is ab...d, a(n) = a^a + b^b +...+ d^d.at n=19A045503
- If decimal expansion of n is ab...d, a(n) = a^a + b^b + ... + d^d (ignoring any 0's).at n=19A045512
- Numbers whose cube is palindromic in base 9.at n=16A046241
- Expansion of g.f. (2-3*x-x^2)/((1-x^2)*(1-3*x)).at n=18A052929
- a(n) = 9^n + 1.at n=9A062396
- Where records occur in A074078.at n=14A074098
- Numbers of the form (9^{mr}-1)/(9^r-1) for positive integers m, r.at n=21A076288
- a(n) = 3^n + (-1)^n - [1/(n+1)], where [] represents the floor function.at n=18A084182
- Numbers of the form (2n+1)^(2n+1) + 1.at n=4A085602
- Expansion of (1- 2*x - x^2)/((1-x)*(1-3*x)).at n=19A094388
- a(n) = (-1)^n * [x^n] Sum_{k>=1} x^(k-1)/(1+3*x^k).at n=18A101561
- a(n) = 3^n + (-1)^n.at n=18A102345
- a(n) = 3^n + 1 - 0^n.at n=18A103457
- a(n) = 9^n + 1 - 0^n.at n=9A103460
- a(n) = smallest number that leads to a new cycle under the base-9 Kaprekar map of A165110.at n=13A165127