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%I #10 Apr 18 2023 05:27:58
%S 1,2,3,2,3,2,7,0,2,0,3,2,10,2,2,0,2,0,5,0,4,0,4,0,3,0,4,0,6,0,6,0,4,0,
%T 3,0,3,0,6,0,4,0,4,0,4,0,4,0,5,0,7,0,2,0,2,0,25,0,10,2,2,0,6,2,2,0,8,
%U 0,8,0,2,0,3,0,2,0,9,0,4,0,5,0,16,0,11
%N If A070281(n) is not 0, then a(n) is index of the starting primes for form A070281(n), or a(n) = 0 if A070281(n) = 0.
%e A070281(13) = 691 = prime(10) + ... + prime(22), thus a(13) = 10.
%Y Cf. A070281, A013916.
%K nonn
%O 1,2
%A _XU Pingya_, May 31 2017
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