Search: id:A051130
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%I A051130
%S A051130 2,3,7,13,42,55,2841
%N A051130 Indices of prime Bell numbers A000110.
%C A051130 Bell(2841) was shown to be a probable prime by Phil Carmody (Dec 22 2002). 
               It has 6531 digits.
%C A051130 Bell(2841) has been certified to be a prime using Primo. This took 17 
               months on a P3-800, a P4-2400 and finally a P4-2800. There are no 
               other terms below 6000. - Ignacio Larrosa Canestro, Feb 13, 2004
%D A051130 E. T. Bell, Exponential numbers, Amer. Math. Monthly, 41 (1934), 411-419.
%H A051130 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               BellNumber.html">Bell Numbers</a>
%H A051130 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               BellNumber.html">Bell Number</a>
%H A051130 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               IntegerSequencePrimes.html">Integer Sequence Primes</a>
%e A051130 The Bell numbers Bell(2)=2, Bell(3)=5, Bell(7)=877 etc. are primes.
%Y A051130 Cf. A000110, A051131.
%Y A051130 Sequence in context: A033995 A013917 A056893 this_sequence A078749 A046062 
               A096263
%Y A051130 Adjacent sequences: A051127 A051128 A051129 this_sequence A051131 A051132 
               A051133
%K A051130 hard,nonn,nice
%O A051130 1,1
%A A051130 Ignacio Larrosa Canestro (ignacio.larrosa(AT)eresmas.net)

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