1138368

Appears in sequences

• Number of 2 X 2 matrices with entries mod n and nonzero determinant.at n=32A005353
• Expansion of 1/((1-4x)(1-6x)(1-8x)(1-10x)).at n=5A028136
• Averages of twin prime pairs k such that k*3 and k/3 are squares.at n=24A154671
• Area A of the bicentric quadrilaterals such that A, the sides, the radius of the circumcircle and the radius of the incircle are integers.at n=28A219192