OFFSET
0,1
COMMENTS
Theorem 3 of Dubickas implies that infinitely many terms of this sequence are divisible by 2 or 3 (and hence infinitely many composites). - Charles R Greathouse IV, Feb 04 2016
REFERENCES
Artūras Dubickas, Prime and composite integers close to powers of a number, Monatsh. Math. 158:3 (2009), pp. 271-284.
MATHEMATICA
Floor[Sqrt[7*2^Range[0, 50]]] (* Harvey P. Dale, Apr 11 2018 *)
PROG
(PARI) a(n)=sqrtint(7<<n) \\ Charles R Greathouse IV, Apr 18 2013
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Feb 01 2013
STATUS
approved