59376240domain: NAppears in sequencesNumerator of the harmonic mean of the first n heptagonal numbers.at n=6A250345Numbers x with k digits in base 2 (MSD(x)_2 = d_1, LSD(x)_2 = d_k) that are equal to the product of the positions of 1's (see examples and formula).at n=4A307218