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A095750
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"Degree" of the Sophie Germain primes (A005384).
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0
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0, 0, 1, 2, 3, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,4
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COMMENTS
| This sequence is derived from the special case of Cunningham chains of the first kind where every member of the chain is a Sophie Germain prime.
This sequence can be obtained by subtracting 2 from A074313 and then deleting all negative members. - David Wasserman (dwasserm(AT)earthlink.net), Sep 13 2007
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LINKS
| C. K. Caldwell, Cunningham Chains.
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
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EXAMPLE
| Entries 0, 0, 1, 2, 3 correspond to the Sophie Germain primes 2, 3, 5, 11, 23. 5 is degree 1 because 5 = (2 * 2) + 1 and 2 is also a Sophie Germain prime. Similarly, 11 = (5 * 2) + 1, therefore 11 is degree 2. 23 = (11 * 2) + 1, thus 23 is degree 3 and so on.
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CROSSREFS
| Cf. A005384.
Sequence in context: A078771 A072771 A194016 * A056966 A037846 A037882
Adjacent sequences: A095747 A095748 A095749 * A095751 A095752 A095753
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KEYWORD
| easy,nonn
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AUTHOR
| Andrew Plewe (aplewe(AT)sbcglobal.net), Jul 09 2004
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EXTENSIONS
| More terms from David Wasserman (dwasserm(AT)earthlink.net), Sep 13 2007
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