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A037037 Number of primes between n and 3n. 0
2, 3, 3, 3, 4, 4, 5, 5, 5, 6, 7, 6, 7, 7, 8, 9, 9, 9, 9, 9, 10, 10, 11, 11, 12, 12, 13, 14, 14, 14, 14, 13, 14, 15, 16, 17, 18, 18, 18, 18, 18, 17, 18, 18, 18, 19, 20, 19, 19, 20, 21, 21, 22, 21, 22, 23, 23, 24, 24, 24, 25, 24, 24, 25, 26, 27, 28, 27, 27, 27, 28, 27, 27, 26, 27, 28 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

EXAMPLE

For example a(5)=4 because between 5 and 15 there are 4 primes.

CROSSREFS

Cf. A014085.

Sequence in context: A178042 A193832 A087823 * A156262 A120565 A194198

Adjacent sequences:  A037034 A037035 A037036 * A037038 A037039 A037040

KEYWORD

nonn

AUTHOR

Felice Russo (frusso(AT)micron.com)

EXTENSIONS

More terms from Erich Friedman (erich.friedman(AT)stetson.edu)

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Last modified February 15 02:50 EST 2012. Contains 205694 sequences.