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Indices (i.e., value of A000720 = primepi) of primes in A111870.
2

%I #14 Sep 03 2024 08:25:27

%S 1,2,4,30,189,217,2225,3385,14357,30802,31545,104071,149689,1094421,

%T 1319945,10655462,23163298,112228683,182837804,203615628,486570087,

%U 1094330259,11992433550,17883926781,50070452577,52302956123,72178455400,94906079600,473258870471,662221289043

%N Indices (i.e., value of A000720 = primepi) of primes in A111870.

%H Amiram Eldar, <a href="/A241542/b241542.txt">Table of n, a(n) for n = 1..32</a> (calculated using Kim Walisch's primecount)

%H Kim Walisch, <a href="https://github.com/kimwalisch/primecount">Fast C++ prime counting function implementation (primecount)</a>.

%F a(n) = A000720(A111870(n)).

%Y Cf. A000720, A111870.

%K nonn

%O 1,2

%A _M. F. Hasler_, Apr 25 2014

%E a(20)-a(30) from _Amiram Eldar_, Sep 03 2024