324135domain: NAppears in sequencesTriangle of coefficients in expansion of (3+7x)^n.at n=25A013624Triangle whose (i,j)-th entry is binomial(i,j)*7^(i-j)*3^j.at n=23A038269a(n) is the largest odd positive integer that is abundant and has the same prime signature as A279537(n) or 0 if no such integer exists.at n=46A343330