OFFSET
1,1
EXAMPLE
a(2) = 0 because prime(2) + 2 = 5 = prime(3).
a(3) = 0 because prime(3) + 2 = 7 = prime(4).
MAPLE
a:= n-> `if`(isprime(ithprime(n)+2), 0, 1):
seq(a(n), n=1..105); # Alois P. Heinz, Oct 02 2020
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
KEYWORD
easy,nonn
AUTHOR
Giovanni Teofilatto, Jan 05 2005
EXTENSIONS
Corrected and extended by Ray Chandler, Jan 09 2005
STATUS
approved