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A100810 a(n) = 0 if prime(n) + 2 = prime(n+1), otherwise 1. 3
1, 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

LINKS

Table of n, a(n) for n=1..105.

FORMULA

a(n) = 1 - A100821(n) = 1 - A062301(n+1).

EXAMPLE

a(2) = 0 because prime(2) + 2 = 5 = prime(3).

a(3) = 0 because prime(3) + 2 = 7 = prime(4).

MATHEMATICA

Table[If[Prime[n] + 2 == Prime[n + 1], 0, 1], {n, 120}] (* Ray Chandler, Jan 09 2005 *)

If[#[[2]]-#[[1]]==2, 0, 1]&/@Partition[Prime[Range[110]], 2, 1] (* Harvey P. Dale, Mar 05 2016 *)

CROSSREFS

Sequence in context: A204171 A267612 A242252 * A174889 A005171 A283265

Adjacent sequences:  A100807 A100808 A100809 * A100811 A100812 A100813

KEYWORD

easy,nonn

AUTHOR

Giovanni Teofilatto, Jan 05 2005

EXTENSIONS

Corrected and extended by Ray Chandler, Jan 09 2005

STATUS

approved

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Last modified December 6 14:47 EST 2019. Contains 329806 sequences. (Running on oeis4.)