39585

Appears in sequences

• Odd integers m such that phi(m) | sigma(m).at n=20A015715
• Odd numbers with exactly 5 distinct prime factors.at n=11A046391
• a(n) = a(n-1) + a(m) for n >= 4, where m = 2*n - 2 - 2^(p+1) and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = 1, a(2) = 2, and a(3) = 3.at n=39A050051
• Smaller of Smith brothers.at n=19A050219
• Numbers k such that usigma(k) = phi(k)*omega(k), where omega(k) is the number of distinct prime divisors of k.at n=21A063795
• Numbers k such that sigma(k) = bigomega(k) * phi(k).at n=17A067238
• Numbers k such that sigma(k) = phi(k*bigomega(k)).at n=16A068400
• Numbers k such that sigma(k) = phi(k)*omega(k).at n=12A073567
• Numbers k such that both k and 2*k are balanced numbers (A020492).at n=29A076375
• Spiro-tetranacci numbers: a(n) = sum of four previous terms that are nearest when terms arranged in a spiral.at n=28A092369
• Fifth column (m=4) of (1,3)-Pascal triangle A095660.at n=27A095661
• Triangle read by rows in which row n gives coefficients of polynomial R_n(y) that satisfies R_n(1/2) = 8^n, where R_n(y) forms the initial (n+1) terms of g.f. A097182(y)^(n+1).at n=39A097181
• Number of positive words of length n in the monoid Br_8 of positive braids on 9 strands.at n=7A097555
• Odd squarefree abundant numbers.at n=10A112643
• Octuple factorial, 8-factorial, n!8, n!!!!!!!!.at n=29A114800
• Odd infinitary abundant numbers.at n=30A127666
• Odd doubly abundant numbers (A125639).at n=3A129087
• Odd unitary abundant numbers.at n=10A129485
• Smallest order of the cyclotomic polynomial whose maximal coefficient in absolute value is n.at n=31A136418
• Numbers n such that sigma(n) = 5*phi(n).at n=10A136547