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Search: id:A067871
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| A067871 |
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Number of primes between consecutive prime powers. |
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+0
1
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| 2, 0, 2, 3, 0, 2, 4, 3, 4, 8, 0, 1, 8, 14, 1, 7, 7, 4, 25, 2, 15, 15, 17, 16, 10, 45, 2, 44, 20, 26, 18, 0, 2, 28, 52, 36, 42, 32, 45, 45, 47, 19, 30, 106, 36, 35, 4, 114, 28, 135, 89, 42, 87, 42, 34, 66, 192, 106, 56, 23, 39, 37, 165, 49, 37, 262, 58, 160, 22, 186, 128, 64, 121, 13
(list; graph; listen)
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OFFSET
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0,1
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FORMULA
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a(n) = A000720(A025475(n+3)) - A000720(A025475(n+2)) - David Wasserman (wasserma(AT)spawar.navy.mil), Dec 20 2002
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EXAMPLE
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The first few prime powers are 4, 8, 9, 16. The first few primes are 2, 3, 5, 7, 11, 13. We have (4), 5, 7, (8), (9), 11, 13, (16) and so the sequence begins with 2, 0, 2.
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CROSSREFS
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Adjacent sequences: A067868 A067869 A067870 this_sequence A067872 A067873 A067874
Sequence in context: A141099 A127710 A137510 this_sequence A060155 A127954 A087509
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KEYWORD
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nonn,easy
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AUTHOR
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Jon Perry (perry(AT)globalnet.co.uk), Mar 07 2002
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EXTENSIONS
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More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Dec 20 2002
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