A046037 Numbers n for which floor((3/2)^n) is composite.

8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 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, 75, 76, 77, 78

Offset

1,1

References

R. K. Guy, Unsolved Problems in Number Theory, E19.

Links

Table of n, a(n) for n=1..69.

Eric Weisstein's World of Mathematics, Floor Function

Mathematica

Select[Range[100], CompositeQ[Floor[(3/2)^#]]&] (* Harvey P. Dale, Sep 23 2014 *)

Prog

(PARI) is(n)=n>7&&!isprime(floor(1.5^n)) \\ Charles R Greathouse IV, Oct 27 2011

Crossrefs

Sequence in context: A004449 A168098 A020722 * A089017 A182361 A023391

Adjacent sequences: A046034 A046035 A046036 * A046038 A046039 A046040

Keyword

nonn

Author

Eric W. Weisstein

Status

approved