%I A075882
%S A075882 1,4,4,16,12,40,28,60,40,84,64,196,96,280,160,252,160,332,280,420,352,
%T A075882 672,396,636,416,756,624,912,576,1044,672,1232,840,1416,1136,1616,1152,
%U A075882 2640,1380,1764,1540,2292,1696,2552,1872,2816,1896,4524,2208,4032,2120
%N A075882 a(n) = phi(Sum_{i=1,...,n} prime(i)).
%e A075882 The sum of the first three primes = 10 and phi(10) = 4, so a(3) = 4.
%t A075882 Table[EulerPhi[Sum[Prime[k], {k, 1, i}]], {i, 1, 100}]
%Y A075882 Sequence in context: A127473 A079611 A160020 this_sequence A125757 A056450 
               A141125
%Y A075882 Adjacent sequences: A075879 A075880 A075881 this_sequence A075883 A075884 
               A075885
%K A075882 nonn
%O A075882 1,2
%A A075882 Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Oct 16 2002