1100190

Appears in sequences

• Let S(n)=sigma(n)/3. Numbers k such that S(S(k))=k, 1/3-sociable number of order 1 or 2.at n=5A113546
• Conjectured list of smallest members of fully k-sociable cycles of order r.at n=30A183026
• Let S(n)=sigma(n)/3. Numbers k such that S^m(k)=k, 1/3-sociable numbers (of any order).at n=22A356548
• Number of unlabeled simple connected graphs with n nodes of degree at most 3 and each node a member of exactly one cycle.at n=30A380805