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A080156
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Values of n corresponding to the terms in sequence A080155. For any k, the concatenation of the a(1) to a(k)-th primes is prime and each value of k is the smallest for which this is true.
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0
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1, 2, 5, 11, 15, 50, 54, 106, 148, 149, 156, 188, 200, 211, 248, 326, 359, 374, 417, 467, 699, 798, 891, 966, 1038, 1519, 1542, 1578, 1831, 1908, 1982, 2079, 2305, 2640, 2660, 2845, 3078, 3145, 3760, 3777, 3835, 4538, 4630, 4991
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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FORMULA
| A080155(n) = ithprime(a(n)).
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MAPLE
| with(numtheory): pout := [2]: nout := [1]: for n from 2 to 5000 do: p := ithprime(n): d := parse(cat(seq(pout[i], i=1..nops(pout)), p)): if (isprime(d)) then pout := [op(pout), p]: nout := [op(nout), n]: fi: od: nout;
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CROSSREFS
| Cf. A073640, A080152-A080155.
Sequence in context: A191163 A026228 A003420 * A082083 A024917 A081402
Adjacent sequences: A080153 A080154 A080155 * A080157 A080158 A080159
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KEYWORD
| nonn,base
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AUTHOR
| Mark Hudson (mrmarkhudson(AT)hotmail.com), Jan 31 2003
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EXTENSIONS
| Edited by Charles R Greathouse IV (charles.greathouse(AT)case.edu), Apr 30 2010
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