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A101344 Number of primes between prime(n) and 3prime(n). +0
1
2, 2, 3, 4, 6, 6, 8, 8, 10, 13, 13, 17, 17, 17, 19, 21, 23, 24, 27, 27, 26, 29, 30, 32, 36, 36, 36, 38, 37, 38, 44, 45, 47, 46, 51, 51, 54, 55, 56, 57, 58, 58, 62, 62, 62, 62, 68, 73, 74, 74, 74, 75, 75, 79, 81, 82, 82, 83, 86, 86, 85, 89, 94, 94, 94, 95, 100, 101, 106, 105, 106 (list; graph; listen)
OFFSET

1,1

EXAMPLE

a(1)=2 because between p=2 and 6 there are exactly two primes, 3

and 5.

MATHEMATICA

Table[ PrimePi[3Prime[n]] - n, {n, 70}]

CROSSREFS

Sequence in context: A118975 A087724 A152047 this_sequence A161204 A152048 A046934

Adjacent sequences: A101341 A101342 A101343 this_sequence A101345 A101346 A101347

KEYWORD

easy,nonn

AUTHOR

Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Dec 25 2004

EXTENSIONS

Corrected and extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Dec 25, 2004

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.


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