52744

Appears in sequences

• Numbers k such that 2*7^k - 1 is prime.at n=15A002959
• Numbers n such that phi(n) = sigma(n) - sigma(n+1).at n=5A063943
• a(n) = 2^n + n*3^n.at n=8A086090
• Number of compositions of n such that the number of parts and the greatest part are not coprime.at n=17A199887
• Number of (w,x,y) with all terms in {0,...,n} and |w-x| != |x-y|.at n=37A212960
• Number of (n+1) X (3+1) 0..4 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 1, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings).at n=8A234877
• G.f. 1-(2*x^3)/(-sqrt(-3*x^4-4*x^3-2*x^2+1)-x^2+1).at n=22A247162
• Number of partitions of n into at most 1^2 copy of 1, 2^2 copies of 2, 3^2 copies of 3, ... .at n=51A303944