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Search: id:A125517
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| A125517 |
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Number of prime quintuplets up to 10^n. |
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+0
1
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| 0, 3, 5, 9, 21, 65, 321, 1383, 7221, 40414, 245312, 1552223
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OFFSET
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1,2
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EXAMPLE
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a(3)=5 because there are 5 prime quintuplets less than 10^3: 3 of the form p + 0,2,6,8,12 (for p = 5,11 and 101) and 2 of the form p + 0,4,6,10,12 (for p = 7 and 97).
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CROSSREFS
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Cf. A022006, A022007.
Sequence in context: A136401 A147758 A129787 this_sequence A147038 A146275 A089636
Adjacent sequences: A125514 A125515 A125516 this_sequence A125518 A125519 A125520
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KEYWORD
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nonn
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AUTHOR
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Martin Raab (raab-martin(AT)gmx.de), Jan 21 2007
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