120089

Appears in sequences

• Quasi-Carmichael numbers to base -7: squarefree composites n such that prime p|n ==> p+7|n+7.at n=18A029567
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 0, 1), (0, 1, 1), (1, -1, -1), (1, 1, -1)}.at n=10A148892
• Positive numbers y such that y^2 is of the form x^2+(x+409)^2 with integer x.at n=11A160577