-1073

Appears in sequences

• Coefficients of the A-Rogers-Selberg identity.at n=55A104408
• For all n >= 2, Sum_{2<=k<=n, gcd(k,n)>1} a(k) = n. a(1)=1.at n=65A124386
• Expansion of Product_{k>=1} 1 / (1 + x^k - x^(2*k)).at n=15A276527
• The Euclid tree with root 1 encoded by semiprimes, read across levels.at n=45A295512