Search: id:A131101
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%I A131101
%S A131101 1,2,3,5,11,23,27,29,30,32,36,41,53,60,66,75,78,83,89,113,114,117,130,
%T A131101 131,132,138,140,171,173,175,179,186,191,204,220,233,239,240,246,251,
%U A131101 255,258,260,276,279,281,285,286,293,308,310,325,338,340,354,359,363
%N A131101 Numbers that when added it to their prime factors +1 the result is a 
               prime number, member of A131102.
%C A131101 The Sophie Germain prime numbers (A005384) they are part of this sequence 
               because when add to one of this its only prime factor (itself) + 
               1 = 2*A005384 + 1 the result are another prime number (A005385)
%F A131101 a(n)+ prime factors of a(n) + 1 = p ; p is a prime number, member of 
               A131102.
%e A131101 a(8)=29 because 29 + its only prime factor (itself) + 1 = 29+29+1= 59, 
               59 are a prime number = A131102(8)=A005385(6) ; a(9)=30 becasue 30 
               + its prime factors + 1 = 30 +(2+3+5)+1 =41, 41 are a prime number 
               = A131102(9).
%Y A131101 Sequence in context: A073880 A118332 A118333 this_sequence A005384 A118571 
               A118504
%Y A131101 Adjacent sequences: A131098 A131099 A131100 this_sequence A131102 A131103 
               A131104
%K A131101 easy,nonn
%O A131101 1,2
%A A131101 Tomas Xordan (xordan.tom(AT)gmail.com), Jun 14 2007

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