3145729
domain: N
Appears in sequences
- a(0) = 1; thereafter a(n) = 3*2^(n-1) + 1.at n=21A004119
- a(n) = T(5,n), array T given by A048472.at n=16A048477
- Values of n such that Sum[ -(-1)^(k) n/k (n-1)/(k+1),{k,1,n}] (n!!) is an integer.at n=40A078621
- a(1) = 2, a(2) = 4; a(n) = 2*a(n-1) - 1.at n=21A103204
- Semiprimes in A103378.at n=31A103398
- 1 + (n+6)*2^(n-1).at n=18A115618
- Sum of the digits of 5^(10^n).at n=6A124306
- a(n) = 3*4^n + 1.at n=10A140660
- a(n) = 3*2^n + 1.at n=20A181565
- 1/4 the number of (n+1) X 3 0..2 arrays with every 2 X 2 subblock having distinct clockwise edge differences.at n=41A209721
- Numbers of the form 2^k+3 or 3*2^k+1, k >= 2.at n=38A245179
- Indices where A354169 is the sum of two consecutive powers of 2.at n=38A354775