41656

Appears in sequences

• Number of 5-tuples of different integers from [ 1,n ] with no global factor.at n=23A015640
• Numbers n such that the arithmetic, geometric and harmonic means of phi(n) and sigma(n) are all integers.at n=21A065146
• Numbers k such that sigma(k) = 4*phi(k).at n=17A068390
• Numbers k such that sigma(k) = phi(k*bigomega(k)).at n=17A068400
• Numbers n such that 9*10^n + 6*R_n - 5 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=20A103103
• 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, 0, 0), (-1, 1, 1), (0, -1, 0), (1, 0, -1), (1, 1, 0)}.at n=9A149353
• Number of ordered triples (w,x,y) with all terms in {-n,...-1,1,...,n} and w+2x+3y>1.at n=22A211622
• Numbers of the form x = 2^k*p*q, p,q odd primes, such that sigma(x)/phi(x) = 4.at n=5A292422
• Integers n such that sigma(n)/phi(n) is a perfect square.at n=31A293391