A140823 - OEIS

A140823

Integers that are not perfect fourth powers.

2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74

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OFFSET

1,1

COMMENTS

First differs from A046100 at {32, 48, 64, 80, 96, 112, 144, 160, 162, ...}.

LINKS

Table of n, a(n) for n=1..72.

A. J. dos Reis and D. M. Silberger, Generating nonpowers by formula, Math. Mag., 63 (1990), 53-55.

FORMULA

{a(n) in A000027 and a(n) not in A000583}.

MATHEMATICA

Module[{nn=100, fp}, fp=Floor[Surd[nn, 4]]; Complement[Range[nn], Range[ fp]^4]] (* Harvey P. Dale, Dec 09 2013 *)