26543

Appears in sequences

• Second member of Diophantine pair (m,k) that satisfies 7*(m^2 + m) = k^2 + k; a(n) = k.at n=7A077401
• Numbers n such that 2^n+25229 is prime.at n=58A103148
• Sequence needed for the nonpositive powers of rho(11) = 2*cos(Pi/11) in the power basis of the degree 5 number field Q(rho(11)). Negative of the coefficients of the second power.at n=8A230081
• a(n) = number of decimal digits of A007505(n).at n=42A275247
• a(n) is the sum of all products of pairs of numbers joined by the diagonals of an n-gon when its vertices are numbered from 1 to n in order.at n=21A337130