168739

Appears in sequences

• Numbers k such that sigma(triangular(k)) = sigma(k)^2.at n=14A232355
• Numbers k with the property that it is possible to write the base 2 expansion of k as concat(a_2,b_2), with a_2>0 and b_2>0 such that, converting a_2 and b_2 to base 10 as a and b, we have sigma(a + b) = sigma(k).at n=32A258843
• Number k such that A033634(k) = A033634(k+1).at n=33A349224