Search: id:A105434
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%I A105434
%S A105434 1,2,4,6,9,12,16,20,24,28,32,36,41,46,51,56,61,66,71,76,81,86,91,96,102,
%T A105434 108,114,120,127,134,141,148,155,162,169,176,183,190,197,204,211,218,
%U A105434 225,232,239,246,253,260,267,274,281,288,295,302,309,316,323,330,337
%N A105434 a(1)=1. a(n+1) = a(n) + (number of terms, from among the first n terms 
               of the sequence, which occur among (d(a(1)),d(a(2)),d(a(3)),...d(a(n))), 
               where d(n) = A000005(n)).
%t A105434 f[l_] := Append[l, l[[ -1]] + Count[MemberQ[l, # ] & /@ Union@DivisorSigma[0, 
               l], True]]; Nest[f, {1}, 58]
%Y A105434 Cf. A000005. A variant of A130798.
%Y A105434 Sequence in context: A155752 A145801 A033291 this_sequence A145196 A061536 
               A095114
%Y A105434 Adjacent sequences: A105431 A105432 A105433 this_sequence A105435 A105436 
               A105437
%K A105434 nonn
%O A105434 1,2
%A A105434 Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 26 2007

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