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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 Table of n, a(n) for n=1..51. 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 Adjacent sequences: A192539 A192540 A192541 * A192543 A192544 A192545 KEYWORD nonn AUTHOR Juri-Stepan Gerasimov, Jul 03 2011 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.)