174717

Appears in sequences

• a(1)=1, a(2)=2, a(3)=3; for n >= 3, a(n) is smallest number such that all a(i) for 1 <= i <= n are distinct, all a(i)+a(j) for 1 <= i < j <= n are distinct and all a(i)+a(j)+a(k) for 1 <= i < j < k <= n are distinct.at n=40A036241
• Numbers k such that k and k+1 have the same sum but an unequal number of divisors.at n=22A054007
• Numbers k such that sigma(k)*omega(k) = sigma(k+1)*omega(k+1), where omega(k) is the number of distinct prime divisors of n (A001221).at n=19A063071
• Number of ON cells at n-th stage of three-dimensional version of the cellular automaton A160117 using cubes.at n=32A160379