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 A176820 Number of primes between 3*A171821(2n-1) and 3*A171821(2n). 0
 1, 2, 1, 1, 1, 1, 2, 0, 1, 0, 0, 1, 1, 1, 1, 1, 1, 2, 0, 1, 0, 1, 1, 0, 1, 1, 1, 0, 0, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 0, 1, 1, 0, 1, 0, 0, 0, 0, 2, 0, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 1, 1, 0, 0, 2, 0, 0, 0, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 0 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Where 2 together with twin primes in A171821. LINKS EXAMPLE a(1)=1 because 3*A171821(2*1-1)=6<7(prime)<3*A171821(2*1)=9; a(2)=2 because 3*A171821(2*2-1)=15<17(prime<19(prime)<3*A171821(2*2)=21. CROSSREFS Sequence in context: A326698 A299432 A252911 * A328384 A016024 A238988 Adjacent sequences:  A176817 A176818 A176819 * A176821 A176822 A176823 KEYWORD nonn AUTHOR Juri-Stepan Gerasimov, Apr 26 2010 EXTENSIONS a(42) corrected by R. J. Mathar, May 06 2010 STATUS approved

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Last modified January 22 13:41 EST 2020. Contains 331149 sequences. (Running on oeis4.)