50065

Appears in sequences

• Odd integers m such that phi(m) | sigma(m).at n=21A015715
• Numbers n such that sigma(n) = 2*phi(n).at n=5A062699
• Numbers k such that sigma(k) = phi(k*bigomega(k)).at n=18A068400
• Numbers n such that sigma(n) = phi(3n).at n=11A074891
• Numbers k such that both k and 2*k are balanced numbers (A020492).at n=31A076375
• Numbers k such that k, 2*k and 4*k are balanced numbers (A020492).at n=13A076376
• Balanced numbers (A020492) k such that k mod 12 = 1.at n=3A110597
• Numbers of the form m = p1 * p2 * p3 * p4 where for each d|m we have (d+m/d)/2 prime and p1 < p2 < p3 < p4 each prime.at n=8A128285
• A triangle sequence derived from setting an Euler numbers A122045 generalization equal to the MacMahon numbers A060187 to get a generating function expansion: p(x,t) = (exp(t)* (1 - exp(x))* x)/(exp(2 t + t x) + exp(t)* x - exp(t*x)* x).at n=42A178234
• Numbers k such that gcd(sigma(k), phi(k)) (A009223) attains record values.at n=28A222711
• Numbers n such that psi(n) = 2*phi(n).at n=29A292390
• Squarefree products of k primes that are symmetrically distributed around their average. Case k = 4.at n=24A294751
• a(n) = (n^3+5*n+3)/3 + 2*floor(n/2) + a(n-2), with a(0)=1 and a(1)=3.at n=32A336529