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A101808 Number of primes between two consecutive even numbers. +0
1
1, 2, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 1, 1, 0, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0 (list; graph; listen)
OFFSET

0,2

FORMULA

a(n)=A101264(n), n>1. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Dec 13 2008]

EXAMPLE

a(1)=2 because between 2 and 4 there are two primes: 2,3;

a(2)=1 because between 4 and 6 there is one prime: 5;

a(4)=0 because between 8 and 10 there is not primes.

CROSSREFS

Sequence in context: A128409 A133699 A157361 this_sequence A145865 A076452 A076453

Adjacent sequences: A101805 A101806 A101807 this_sequence A101809 A101810 A101811

KEYWORD

easy,nonn

AUTHOR

Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Jan 27 2005

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Last modified December 4 23:11 EST 2009. Contains 170347 sequences.


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