76751

Appears in sequences

• Lucas-Carmichael numbers: squarefree composite numbers k such that p | k => p+1 | k+1.at n=21A006972
• a(n) = (n-1)*(2*n-1)*(3*n-1).at n=24A033594
• Lucas-Carmichael numbers with 3 prime factors.at n=15A216925
• Numbers such that the sequence of all possible sums of divisors of n is increasing but not strictly so, the sums being ordered by their characteristic functions, seen as binary numbers (see example).at n=28A230492
• G.f. satisfies: A(x) = 1 + x*A(x) + x^2*A(x)^2 + 3*x^3*A(x)*A'(x) + x^4*A(x)*A''(x).at n=8A245313
• Lucas-Carmichael numbers whose Dedekind psi value is a square.at n=2A292571
• Elliptic Carmichael numbers for the elliptic curve y^2 = x^3 + 80.at n=44A317174
• a(n) = (n/4)*(n^3+2*n^2+5*n+8).at n=23A334694
• Number of regions formed when n points are placed in general position on each edge of a square and a chord is drawn from each point to the 3*n points on the other three sides.at n=10A392172