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A056756 Where n-th prime appears in Euclid-Mullin sequence A000945. 9

%I

%S 1,2,7,3,12,5,13,36,25,33,50,18

%N Where n-th prime appears in Euclid-Mullin sequence A000945.

%t f[1]=2; f[n_] := f[n] = FactorInteger[Product[f[i], {i, 1, n - 1}] + 1][[1, 1]] ems = Table[f[n], {n, 1, 43}]; Do[Print[Position[ems, Prime[n]][[1, 1]]], {n, 1, 25}]

%Y Cf. A000945.

%K nonn,more

%O 1,2

%A _Robert G. Wilson v_, Aug 15 2000

%E Gaps that need filling: 1, 2, 7, 3, 12, 5, 13, 36, 25, 33, 50, 18, ?, 4, ?, 6, ?, 42, ?, 22, ?, ?, ?, 35, 26

%E Two more terms from _Sean A. Irvine_, Sep 20 2012

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Last modified October 24 13:43 EDT 2021. Contains 348232 sequences. (Running on oeis4.)