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384*n + 1.
5

%I #16 Sep 08 2022 08:46:06

%S 1,385,769,1153,1537,1921,2305,2689,3073,3457,3841,4225,4609,4993,

%T 5377,5761,6145,6529,6913,7297,7681,8065,8449,8833,9217,9601,9985,

%U 10369,10753,11137,11521,11905,12289,12673,13057,13441,13825,14209,14593,14977,15361

%N 384*n + 1.

%C Every composite Fermat number has a divisor of the form 384*n + 1, n > 0.

%H Arkadiusz Wesolowski, <a href="/A229853/b229853.txt">Table of n, a(n) for n = 0..1000</a>

%H Wikipedia, <a href="http://en.wikipedia.org/wiki/Fermat_number">Fermat number</a>

%H <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (2,-1).

%F G.f.: (1 + 383*x)/(1 - x)^2.

%p seq(384*n+1, n=0..40);

%t Table[384*n + 1, {n, 0, 40}]

%o (Magma) [384*n+1 : n in [0..40]]

%o (PARI) for(n=0, 40, print1(384*n+1, ", "));

%Y Cf. A000215, A094358, A229854-A229856.

%K nonn,easy

%O 0,2

%A _Arkadiusz Wesolowski_, Oct 01 2013

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Last modified September 22 23:47 EDT 2024. Contains 376140 sequences. (Running on oeis4.)