OFFSET
1,1
COMMENTS
a(n) = A026438(n+1) for n > 1. - Georg Fischer, Oct 22 2018
LINKS
Ivan Neretin, Table of n, a(n) for n = 1..1000
MATHEMATICA
a = {3, 4}; used = Flatten@Outer[Times, a, a] - 1; Do[k = a[[-1]] + 1; While[MemberQ[used, k], k++]; AppendTo[a, k]; used = Union[used, k*a - 1], {n, 3, 60}]; a (* Ivan Neretin, Feb 15 2018 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved