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A075743 For all numbers of the form 6 +/- 1 starting with 5,7,11,13..., '1' indicates prime and '0' indicates composite. 7
1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 1, 0, 1, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 1, 0, 1, 1, 0, 0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 1, 1, 1, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(n) = A010051(A007310(n+2)). - Reinhard Zumkeller, Oct 02 2008

The sequence may described as: for all numbers k(n) [k(n) = 6 ceil(n/2) + (-1)^n] congruent to -1 or +1 (mod 6) starting with k(n) = {5,7,11,13,...}, a(k(n)) is 1 if k(n) is prime and 0 if k(n) is composite. - Daniel Forgues, Mar 01 2009

LINKS

Daniel Forgues, Table of n, a(n) for n = 1..33332

MATHEMATICA

Boole[PrimeQ/@Flatten[Table[6n+{-1, 1}, {n, 60}]]] (* Harvey P. Dale, Jun 04 2017 *)

CROSSREFS

Cf. A000040.

Absolute value of A156706.

Sequence in context: A167686 A190207 A156706 * A136705 A141646 A129573

Adjacent sequences:  A075740 A075741 A075742 * A075744 A075745 A075746

KEYWORD

easy,nonn

AUTHOR

Stephan Wagler (stephanwagler(AT)aol.com), Oct 08 2002

EXTENSIONS

Offset corrected by N. J. A. Sloane, Feb 02 2009

STATUS

approved

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Last modified August 19 08:17 EDT 2019. Contains 326115 sequences. (Running on oeis4.)