135340domain: NAppears in sequencesStarting positions of strings of four 4's in the decimal expansion of Pi.at n=9A083616Sums of squares of primitive roots of primes.at n=27A089453Numbers k such that s(k) = s(k+1), where s(k) is the unitary analog of the alternating sum-of-divisors function (A307037).at n=35A333408