75627

Appears in sequences

• Numbers k such that sigma(sigma(k)-k) = phi(k).at n=17A074875
• a(1)=2. a(n) is the a(n-1)st integer from among those positive integers coprime to a(n-1).at n=23A126882
• 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, 0), (-1, 0, 0), (0, 1, -1), (0, 1, 1), (1, -1, 0)}.at n=10A148868