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A051861
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Twice the positions in A051686 at which new primes appears in the sequence.
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2
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2, 4, 16, 38, 58, 72, 148, 170, 178, 282, 388, 446, 512, 652, 656, 758, 836, 856, 1514, 1592, 1648, 1712, 1906, 1918, 2034, 2606, 2758, 4094, 4936, 5624, 5758, 5842, 5924, 6764, 8188, 10570, 10922, 11072, 11482, 13082, 13972, 14626, 15212, 16018, 18986
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Halving this sequence gives 1,2,8,19,...,256,326,...,47764,.., the indices in A051686 at which primes appear which have not occurred before. A051692 shows the same values not in order of their magnitude, but in increasing order of the emerging primes in A051686.
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CROSSREFS
| Cf. A051686, A051692, A005384.
Sequence in context: A189838 A000216 A110998 * A048222 A192890 A062330
Adjacent sequences: A051858 A051859 A051860 * A051862 A051863 A051864
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KEYWORD
| nonn
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AUTHOR
| Labos E. (labos(AT)ana.sote.hu), Dec 14 1999
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