45967domain: NAppears in sequencesTerms k of A002977 such that both (k-1)/2 and (k-1)/3 are also terms of A002977.at n=15A085249Nonprime numbers whose cototient is a decimal repunits >1 from A002275.at n=12A098218Floor of sum of the first n^2 square roots.at n=41A138357a(n) = 68*n^2 - 1.at n=25A158730