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A048614 Number of primes between successive pairs of twin primes. 13
0, 0, 0, 1, 1, 2, 1, 4, 0, 3, 0, 4, 0, 0, 2, 1, 3, 1, 2, 3, 10, 0, 4, 7, 4, 3, 2, 1, 2, 18, 0, 0, 2, 2, 17, 0, 1, 0, 2, 6, 9, 3, 1, 1, 1, 8, 3, 2, 0, 15, 1, 4, 1, 1, 7, 7, 0, 4, 0, 4, 3, 4, 0, 1, 0, 1, 7, 2, 5, 1, 5, 18, 2, 5, 4, 3, 1, 5, 1, 18, 0, 12, 2, 8, 0, 1, 4, 2, 0, 0, 5, 0, 4, 1, 1, 1, 9, 10, 4, 2, 6 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,6
LINKS
FORMULA
a(n) = A027833(n)-2 for n>1. - T. D. Noe, Feb 28 2007
EXAMPLE
a(8)= 4 because between the 8th and 9th pairs of twins there are 4 primes: (71,73) 79 83 89 97 (101,103).
MATHEMATICA
t1=Select[Prime[Range[3, 542]], PrimeQ[#+2]&]; Prepend[Table[PrimePi[t1[[i+1]]]-PrimePi[t1[[i]]]-2, {i, 1, Length[t1]-1}], 0] (* Jayanta Basu, May 26 2013 *)
CROSSREFS
Sequence in context: A220504 A087569 A341509 * A001442 A226952 A158285
KEYWORD
nonn,easy
AUTHOR
Den Roussel (DenRoussel(AT)webtv.net)
EXTENSIONS
Corrected and extended by Labos Elemer, Mar 23 2000
STATUS
approved

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Last modified June 20 22:01 EDT 2024. Contains 373532 sequences. (Running on oeis4.)