1,1

a(1) = 417979 because p(417979) = 6080051 and we have 3 x 3 square with desired property:

................................................

..........6080051...6080059...6080069.=>.18240179

..........6080131...6080141...6080147.=>.18240419

..........6080149...6080153....6080161.=>.18240463.

........//...||........||........||...\.

.18240359....VV........VV........VV...18240353.

..........18240331...18240353...18240377.

Cf. A097231.

Sequence in context: A043609 A078519 A104920 this_sequence A084734 A130022 A003828

Adjacent sequences: A116933 A116934 A116935 this_sequence A116937 A116938 A116939

more,nonn

Zak Seidov (zakseidov(AT)yahoo.com), Feb 27 2006