For n>2, a(n) is base at which zero is reached for the function "write f(j) in base j, read as base j+1 and then subtract 1 to give f(j+1)" starting from f(n)=2n^2-1.
Table of n, a(n) for n=1..5.
a(n) =A003261(A036289(n)) =A036289(n)*A001146(n)^n-1
Sequence in context: A145253 A248730 A024099 * A139299 A004818 A125538
Adjacent sequences: A056232 A056233 A056234 * A056236 A056237 A056238
Henry Bottomley, Aug 06 2000