OFFSET
1,1
COMMENTS
n such that prime(n)+prime(n+1)+prime(n+2), prime(n+3)+prime(n+4)+prime(n+5), prime(n+6)+prime(n+7)+prime(n+8), prime(n)+prime(n+3)+prime(n+6), prime(n+1)+prime(n+4)+prime(n+7), prime(n+2)+prime(n+5)+prime(n+8), prime(n)+prime(n+4)+prime(n+8), prime(n+2)+prime(n+4)+prime(n+5) are all prime. - Robert Israel, Jan 24 2018
EXAMPLE
417979 is in the sequence because prime(417979) = 6080051 and we have this 3 X 3 square with the desired property:
.
6080051 6080059 6080069 => 18240179
.
6080131 6080141 6080147 => 18240419
.
6080149 6080153 6080161 => 18240463
// || || || \\
18240359 VV VV VV 18240353
18240331 18240353 18240377
CROSSREFS
KEYWORD
nonn
AUTHOR
Zak Seidov, Feb 27 2006
EXTENSIONS
Extended by D. S. McNeil, Dec 16 2010
STATUS
approved