122520

Appears in sequences

• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 35.at n=9A031713
• First element r of (-1)sigma sociable triple (r,s,t): s=(-1)sigma(r), t=(-1)sigma(s), r=(-1)sigma(t), where if x=Product p(i)^r(i), then (-1)sigma(x)=Product(-1+(Sum p(i)^s(i), s(i)=1 to r(i))).at n=29A049057
• 3rd level triangle related to Eulerian numbers and binomial transforms (A062253 is second level, triangle of Eulerian numbers is first level and triangle with Z(0,0)=1 and Z(n,k)=0 otherwise is 0th level).at n=32A062254
• a(n) = n! * Sum_{k=1..n} k/floor(n/k).at n=6A345684