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Search: id:A128194
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| A128194 |
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Absolute value of second differences of values of n for Cullen primes in A005849. |
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+0
2
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| 4432, 3490, 266, 11069, 1911, 13619, 27010, 3982, 31169, 72698, 21768, 752305
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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In this sequence a(3) and a(5) are primes. Also a(1)+1, a(6)+1 and a(7)+1 are primes. And a(10)-1 is prime. These may at some future time begin three new sequences.
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FORMULA
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Find the absolute value of second differences of overlapping pairs of values of n
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EXAMPLE
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a(0)=4432 because the first two values of first differences in A128193 are 140 and 4572. 4572-140=4432, the first second difference.
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CROSSREFS
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Cf. A005849 A128193.
Sequence in context: A035784 A108008 A060363 this_sequence A091739 A166582 A043508
Adjacent sequences: A128191 A128192 A128193 this_sequence A128195 A128196 A128197
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KEYWORD
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easy,nonn
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AUTHOR
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Enoch Haga (Enokh(AT)comcast.net), Feb 18 2007
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