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A051692
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Twice the smallest subscript in A051686 such that A051686(n)=p[k], the k-th prime number.
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2
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2, 4, 38, 16, 170, 72, 446, 58, 512, 282, 178, 148, 758, 856, 836, 1592, 1712, 388, 1906, 2606, 2034, 1918, 656, 5924, 1648, 13082, 652, 1514, 2758, 10922, 5758, 18986, 6764, 10570, 20918, 4936, 8188, 5842, 4094, 30710, 15212, 11482, 57932
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| The sequence is based on the first 50000 terms of A051686, in which the first 54 consecutive primes (2,3,..,251) appeared with further 19 ones, largest was 823 at position 37976.
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EXAMPLE
| The 25th term in this sequence is 1648. This means that p(25)=97 arises in A051686 at the position of 1648/2=824. This means that 1648 is the first in the sequence {..,2k,..}={1648,1798,4108, ..} with the property that 2k*97+1= 194k+1 is also a prime, moreover the smallest one:159857.
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CROSSREFS
| Cf. A005384, A051644-A051654, A051860, A051861.
Sequence in context: A063184 A115250 A018304 * A053745 A019275 A012433
Adjacent sequences: A051689 A051690 A051691 * A051693 A051694 A051695
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KEYWORD
| nonn
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AUTHOR
| Labos E. (labos(AT)ana.sote.hu)
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