72345

Appears in sequences

• Numerators of power series for sqrt(1+x^2)/sqrt(1-x).at n=10A067649
• Odd squarefree abundant numbers.at n=26A112643
• Odd unitary abundant numbers.at n=26A129485
• Number of (w,x,y,z) with all terms in {1,...,n} and w < harmonic mean of {x,y,z}.at n=21A212106
• Primitive, odd, squarefree abundant numbers.at n=26A249263
• Number of (n+2)X(1+2) 0..2 arrays with no row, column, diagonal or antidiagonal in any 3X3 subblock summing to 2 or 4.at n=7A251675
• T(n,k)=Number of (n+2)X(k+2) 0..2 arrays with no row, column, diagonal or antidiagonal in any 3X3 subblock summing to 2 or 4.at n=28A251682
• T(n,k)=Number of (n+2)X(k+2) 0..2 arrays with no row, column, diagonal or antidiagonal in any 3X3 subblock summing to 2 or 4.at n=35A251682
• Number of set partitions of [n] such that at least one pair of consecutive blocks (b,b+1) exists having no pair of consecutive numbers (i,i+1) with i member of b and i+1 member of b+1.at n=10A271271
• Odd numbers k such that A(k) == 0 (mod k) (see Comments for details).at n=6A308242
• Odd non-coreful abundant numbers: the odd terms of A308127.at n=26A339938
• Odd numbers k such that A360522(k) > 2*k.at n=26A360526
• Odd modified exponential abundant numbers: odd numbers k such that A241405(k) > 2*k.at n=26A379031
• Odd numbers k such that gcd(A276086(sigma(k)-k), A276086(k)) is equal to A276086(k), where A276086 is the primorial base exp-function, and sigma is the sum of divisors function.at n=37A388267