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 A106002 a(n)=1 if there is a number of the form 6k+3 such that prime(n) < 6k+3 < prime(n+1), otherwise 0. 2
 0, 0, 0, 1, 0, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Except for first two primes and twin primes, there is always at least one number of the form 6k+3 between two successive primes. LINKS EXAMPLE a(3)=0 because between prime(3)=5 and prime(4)=7 there are no numbers of the form 6k+3; a(4)=1 because between prime(4)=7 and prime(5)=11 there is 9=6*1+3. CROSSREFS Same as A100810 after first term. Sequence in context: A174898 A099618 A324883 * A252742 A066247 A151774 Adjacent sequences:  A105999 A106000 A106001 * A106003 A106004 A106005 KEYWORD easy,nonn AUTHOR Giovanni Teofilatto, Apr 29 2005 EXTENSIONS Edited by Ray Chandler, Oct 17 2006 STATUS approved

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Last modified January 22 19:39 EST 2020. Contains 331153 sequences. (Running on oeis4.)