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 A274384 Numbers n such that 2^n is not the average of three positive cubes. 0
 1, 2, 4, 5, 7, 8, 10, 11, 13, 14, 16, 17, 19, 20, 22, 23, 25, 26, 28, 29, 31, 32, 34, 37, 40, 43, 46 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Numbers n such that 3*2^n = x^3 + y^3 + z^3 where x, y, z > 0, is not soluble. Numbers n such that A007283(n) is not the sum of three positive cubes. Sequence is finite because 47, 48, and 49 are not in the sequence and the absence of k from the sequence implies the absence of k+3. - Giovanni Resta, Jun 27 2016 LINKS EXAMPLE 47 is not a term because 2^47 = (8288^3 + 49808^3 + 66800^3) / 3. 49 is not a term because 2^49 = (13379^3 + 70082^3 + 110309^3) / 3. CROSSREFS Cf. A000079, A003072, A007283. Sequence in context: A059564 A001651 A224999 * A195175 A248607 A191266 Adjacent sequences:  A274381 A274382 A274383 * A274385 A274386 A274387 KEYWORD nonn,fini,full AUTHOR Altug Alkan, Jun 19 2016 STATUS approved

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Last modified May 25 01:17 EDT 2019. Contains 323534 sequences. (Running on oeis4.)