

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
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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

Table of n, a(n) for n=1..27.


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



