A046038 Numbers k for which [ (4/3)^k ] is composite.

5, 8, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 39, 40, 41, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82

Offset: 1

Author

Eric W. Weisstein

Keywords

• nonn

References

• Richard K. Guy, Unsolved Problems in Number Theory, 3rd Edition, Springer, 2004, Section E19, p. 338.

Links

• Amiram Eldar, Table of n, a(n) for n = 1..10000
• Eric Weisstein's World of Mathematics, Floor Function.

Crossrefs

Cf. A070762.

Programs

Mathematica

Select[Range[100],CompositeQ[Floor[(4/3)^#]]&] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Oct 01 2019 *)