119685domain: NAppears in sequencesNumbers that cannot be expressed as a sum of 2 triangular numbers and a power of 2.at n=31A112665Numbers m such that abs(K(m+1) - K(m)) = 2, and both m and m+1 are squarefree (A005117), where K(m) = A002034(m) is the Kempner function.at n=29A346212