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A085253 Numbers having no representation as sum of two powerful numbers (A001694). 9
1, 3, 4, 6, 7, 11, 14, 15, 19, 21, 22, 23, 27, 30, 38, 39, 42, 46, 47, 49, 51, 55, 56, 60, 62, 66, 67, 69, 70, 71, 75, 77, 78, 79, 83, 84, 86, 87, 92, 93, 94, 95, 102, 103, 105, 107, 110, 111, 114, 115, 118, 119, 120, 123, 131, 138, 139, 142, 143, 147, 151, 154 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Complement of A076871.
LINKS
Eric Weisstein's World of Mathematics, Powerful Number.
FORMULA
A085252(a(n)) = 0.
MATHEMATICA
With[{m = 160}, pow = Select[Range[m], # == 1 || Min[FactorInteger[#][[;; , 2]]] > 1 &]; Complement[Range[m], Select[Union[Plus @@@ Tuples[pow, {2}]], # <= m &]]] (* Amiram Eldar, Jan 30 2023 *)
CROSSREFS
Different from A075434.
Sequence in context: A079249 A306678 A075434 * A207525 A240208 A349555
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Jun 23 2003
STATUS
approved

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Last modified April 23 16:28 EDT 2024. Contains 371916 sequences. (Running on oeis4.)