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A124413 Numbers k such that 2*k+1, 4*k+1, 8*k+1, 16*k+1 and 32*k+1 are primes. 3

%I #11 Mar 25 2020 06:50:21

%S 765,3420,7695,8325,16650,22185,28995,33300,41715,52935,72510,75075,

%T 82950,99810,104715,106425,115620,121275,145635,159840,165900,173070,

%U 188745,190815,192795,222870,225705,239400,240510,253395,253890,256410

%N Numbers k such that 2*k+1, 4*k+1, 8*k+1, 16*k+1 and 32*k+1 are primes.

%H Amiram Eldar, <a href="/A124413/b124413.txt">Table of n, a(n) for n = 1..10000</a>

%t Select[15*Range[20000], And @@ PrimeQ /@ ({2, 4, 8, 16, 32}*# + 1) &] (* _Ray Chandler_, Nov 21 2006 *)

%Y Cf. A005097, A123998, A124041, A124412-A124417.

%K nonn

%O 1,1

%A _Artur Jasinski_, Nov 02 2006

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Last modified May 29 05:33 EDT 2024. Contains 372921 sequences. (Running on oeis4.)