10460353204
domain: N
Appears in sequences
- a(n) = sigma_21(n), the sum of the 21st powers of the divisors of n.at n=2A013969
- Numerator of sum of -21st powers of divisors of n.at n=2A017705
- a(n) = 3^n + 1.at n=21A034472
- Maximal term in Collatz-iteration started at 3^n+1.at n=21A087972
- Maximal term in Collatz-iteration started at 3^n.at n=19A087973
- Expansion of (1- 2*x - x^2)/((1-x)*(1-3*x)).at n=22A094388
- a(n) = 3^n + 1 - 0^n.at n=21A103457
- a(n) = 3^n - (-1)^n.at n=21A105723
- Pierpont 7-almost primes. 7-almost primes of form (2^K)*(3^L)+1.at n=1A113739
- a(n) = 2*A132357(n).at n=20A135263
- Triangle T(n, k) = [x^k](p(x, n, q)) where p(x,n,q) = Product_{j=1..n} (x + q^j) + Product_{j=1..n} (x*q^j + 1), p(x, 0, q) = 1, and q = 3, read by rows.at n=21A173049
- Triangle T(n, k) = [x^k](p(x, n, q)) where p(x,n,q) = Product_{j=1..n} (x + q^j) + Product_{j=1..n} (x*q^j + 1), p(x, 0, q) = 1, and q = 3, read by rows.at n=27A173049
- One third the number of n X 2 0..3 arrays with no element equal to its row sum plus its column sum mod 4.at n=10A183430
- a(n) = 3*9^n + 1.at n=10A199561
- Image of n under the 3^x+1 map, which is a variation of the 3x+1 (Collatz) map.at n=20A336913