OFFSET
1,2
COMMENTS
This sequence is finite with 14 terms and 23 is the largest term (see Prime Curios link); a proof can be found in comments of A331801.
LINKS
G. L. Honaker, Jr. and Chris K. Caldwell, Prime Curios! 23
EXAMPLE
With the two smallest nonsquarefree numbers 4 and 8, it is not possible to get 1, 2, 3, 4, 5, 6, 7, 9, 10 and 11 as sum of two nonsquarefree numbers.
MATHEMATICA
max = 25; Complement[Range[max], Union @ Select[Total /@ Tuples[Select[Range[max], !SquareFreeQ[#] &], 2], # <= max &]] (* Amiram Eldar, Feb 24 2020 *)
CROSSREFS
KEYWORD
nonn,full,fini
AUTHOR
Bernard Schott, Feb 23 2020
STATUS
approved