85897domain: NAppears in sequences75-gonal numbers: a(n) = n*(73*n-71)/2.at n=49A098230Numbers k such that (412*10^k - 7)/9 is prime.at n=20A294125Number of tilings of a 12 X n rectangle using 2*n copies of the disconnected shape [ooo___ooo].at n=28A323423