152019

Appears in sequences

• Intersection of A065764 and A065765: n such that x and y exist with sigma[x^2] = n = sigma[2*(y^2)].at n=8A065767
• Number of lower triangles of an (n+4) X (n+4) 0..3 array with new values introduced in row major order 0..3 and no element unequal to more than one horizontal or vertical neighbor.at n=9A194773
• a(n) = (n - 1)*(n^3 + 1) = n^4 - n^3 + n - 1, for n >= 1.at n=19A242604
• Odd numbers m such that sigma(x) = m has more than 1 solution.at n=35A300869
• "Primitive" numbers k such that k divides 4^k - 1.at n=37A323203