69028domain: NAppears in sequencesLet M(n) be the n X n matrix m(i,j)=min(i,j) for 1<=i,j<=n; then a(n) is the trace of M(n)^(-7).at n=21A114359Numbers k with squares that are concatenations k^2 = x//y such that x is an anagram of y.at n=30A162945Numbers n such that 7*8^n + 1 is prime.at n=9A269544