1083537

Appears in sequences

• Integers of the form (Product_{i=1..k} sigma(i))/(Product_{i=1..k} phi(i)) = A066780(k)/A001088(k).at n=8A066986
• Pairs of primitive deficient numbers having the same value of sigma(k)/k, listed by increasing value of the larger of the two k values.at n=28A212610
• Primitive deficient numbers n having a companion m > n such that sigma(n)/n = sigma(m)/m (ordered by increasing (smallest possible) m).at n=14A212611
• Irregular triangle T(n,k), n >= 0, 0 <= k < 2^(n-1), where T(n,k) = Product_{j=0..n-1} prime(j+1)^((n-j)*d_j), where d_j is the bit with digit weight 2^j in the binary expansion of 2^(n-1)+k.at n=42A384003