141237625domain: NAppears in sequencesa(n) = (7^n+1)/2.at n=10A034494Sequence demonstrating the Pythagorean theorem.at n=5A120694a(n) = ((2*n+1)^5+(-1)^n)/2.at n=24A175111a(n) is the smallest positive integer of length (distance from origin) n in the Cayley graph of the integers generated by all powers of 7.at n=30A297180