OFFSET
1,3
COMMENTS
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
EXAMPLE
a(1)=0 because 2*0^2-3=-3=nonprime and 2*0^2+3=3=prime; a(2)=1 because 2*1^2-3=-1=nonprime and 2*1^2+3=5=prime; a(3)=4 because 2*4^2-3=29=prime and 2*4^2+3=35=nonprime; a(4)=7 because 2*7^2-3=95=nonprime and 2*7^2+3=101=prime.
MATHEMATICA
Join[{0}, Select[Range[200], Sort[PrimeQ[2 #^2+{3, -3}]]=={False, True}&]] (* Harvey P. Dale, Apr 06 2012 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Juri-Stepan Gerasimov, Mar 09 2010
EXTENSIONS
Extended beyond 71 by R. J. Mathar, Apr 20 2010
STATUS
approved