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A090869
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Irregular primes whose indices are irregular primes of order one.
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1
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613, 877, 1117, 1721, 1753, 2153, 2557, 2671, 4349, 4943, 5039, 5179, 5443, 5641, 5939, 6037, 6827, 6997, 7591, 7853, 8069, 8209, 8527, 8669, 9221, 9311, 9377, 9859, 10729, 11149, 11353, 11503, 11933, 12211, 12413, 12743, 12923, 13001, 13037, 13367, 13693, 13729, 13999, 14369, 14449, 14551, 14759, 15541, 15923, 16141
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OFFSET
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1,1
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COMMENTS
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This sequence is infinite.
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LINKS
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Mohammad Amin Shokrollahi, Tables [broken, empty document]
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EXAMPLE
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37 is the first irregular prime, 613 is the 37th irregular prime, i.e., iprime(iprime(1)) = 613, so 613 is a member.
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PROG
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(PARI) \\ Irregular prime-indexed primes. Download the linked file (e.g. with "wget https://oeis.org/a090869.txt") into the gp working directory, and start a new PARI session.
iprime = readvec("your_path/a090869.txt");
ipips(n) = for(x=1, n, y=iprime[iprime[x]]; print1(y ", "));
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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