Odd numbers taking exactly 21 steps to reach 15 in A086793.

Terms

a(0) =628425a(1) =824175a(2) =1340325a(3) =1422135a(4) =1495725a(5) =1729665a(6) =1845585a(7) =1853775a(8) =1916145a(9) =2001825a(10) =2015685a(11) =2040675a(12) =2045505a(13) =2091375a(14) =2165625a(15) =2220435a(16) =2226609a(17) =2264535a(18) =2333925a(19) =2360085a(20) =2365965a(21) =2379465a(22) =2465925a(23) =2474955a(24) =2499255a(25) =2511495