500399domain: NAppears in sequencesa(n) contains the digit b-1 in all bases b from 2 to n.at n=17A051640a(n) contains the digit b-1 in all bases b from 2 to n.at n=18A051640Smallest number which does not use digit n-1 written in base n, but does use digit b-1 written in base b for any 1<b<n.at n=19A119354