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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 Amiram Eldar, Table of n, a(n) for n = 1..10000 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 Cf. A001694, A076871, A085252. Different from A075434. Sequence in context: A079249 A306678 A075434 * A207525 A240208 A349555 Adjacent sequences: A085250 A085251 A085252 * A085254 A085255 A085256 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.)