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A076471
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Number of pairs (p,q) of successive primes with p+q<=n.
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2
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0, 0, 0, 0, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13, 13, 13
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,8
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COMMENTS
| A056172(n)-1 <= a(n) <= A056172(n);
a(n) = A076472(n) + A076473(n).
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EXAMPLE
| Pairs (p,q) of successive primes with p+q<=27: {(2,3), (3,5), (5,7), (7,11), (11,13)}, hence a(27)=5.
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CROSSREFS
| Cf. A000720.
Sequence in context: A168255 A097429 A100617 * A165116 A111656 A165118
Adjacent sequences: A076468 A076469 A076470 * A076472 A076473 A076474
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KEYWORD
| nonn
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AUTHOR
| Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Oct 14 2002
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