68832

Appears in sequences

• Numbers k such that the sum of unitary divisors of k^2 is a square.at n=23A064498
• Numbers k such that the sets of prime factors (ignoring multiplicity) of A000203(k) = sigma(k) and of A001157(k) = sigma_2(k) are identical.at n=9A081380
• Large-q series expansion for the exponential of the corner free energy of the square-lattice zero-temperature Potts antiferromagnet, in terms of the variable z = 1/(q - 1).at n=20A238836
• Number of (n+2)X(2+2) 0..1 arrays with every 3X3 subblock sum of four medians of central row, central column, diagonal and antidiagonal nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=2A254506
• T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with every 3X3 subblock sum of four medians of central row, central column, diagonal and antidiagonal nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=8A254512
• Number of (3+2)X(n+2) 0..1 arrays with every 3X3 subblock sum of four medians of central row, central column, diagonal and antidiagonal nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=1A254514
• Number of nX3 0..1 arrays with every element equal to 1, 2 or 4 horizontally or vertically adjacent elements, with upper left element zero.at n=8A301664
• Integers m that satisfy tau(m) + omega(m) = #({phi(x) = m}).at n=32A305656
• Expansion of e.g.f. ( (1/x) * Series_Reversion( x/(1 + sin(x))^2 ) )^(1/2).at n=6A381518