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A192542 Numbers n such that the interval [2^n-n, 2^n] is prime-free. 0
15, 25, 27, 28, 30, 34, 38, 40, 43, 45, 47, 48, 49, 51, 53, 55, 60, 71, 72, 75, 88, 97, 99, 106, 113, 117, 126, 128, 132, 139, 145, 146, 148, 151, 154, 168, 169, 175, 176, 177, 185, 186, 192, 208, 216, 223, 227, 232, 240, 253, 259 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Places n where A192064(n)=0.
The numbers not in the sequence are characterized in A000043, A050414, A059608, A059610, etc.
LINKS
MATHEMATICA
Select[Range[260], NextPrime[2^#-#]>2^#&] (* Harvey P. Dale, Apr 08 2013 *)
PROG
(PARI) is(n)=nextprime(2^n-n)>2^n \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Cf. A192064.
Sequence in context: A216379 A120746 A106613 * A325571 A366926 A102802
KEYWORD
nonn
AUTHOR
EXTENSIONS
Corrected (a(16)=55 inserted) by Harvey P. Dale, Apr 08 2013
STATUS
approved

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Last modified February 29 02:52 EST 2024. Contains 370401 sequences. (Running on oeis4.)