129140164

Appears in sequences

• a(n) = sigma_17(n), the sum of the 17th powers of the divisors of n.at n=2A013965
• Numerator of sum of -17th powers of divisors of n.at n=2A017697
• a(n) = 3^n + 1.at n=17A034472
• Maximal term in Collatz-iteration started at 3^n+1.at n=17A087972
• Maximal term in Collatz-iteration started at 3^n.at n=15A087973
• Expansion of (1- 2*x - x^2)/((1-x)*(1-3*x)).at n=18A094388
• a(n) = 3^n + 1 - 0^n.at n=17A103457
• a(n) = 3^n - (-1)^n.at n=17A105723
• Pierpont 5-almost primes. 5-almost primes of form (2^K)*(3^L)+1.at n=6A111345
• a(n) = 2*A132357(n).at n=16A135263
• 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=8A183430
• a(n) = 3*9^n + 1.at n=8A199561
• a(n) is the smallest number k > 1 such that k^n - 1 is divisible by 3^n.at n=16A316505
• Image of n under the 3^x+1 map, which is a variation of the 3x+1 (Collatz) map.at n=16A336913
• Inverse permutation of A356867, where A356867 is Sycamore's Doudna variant D(3).at n=66A365390