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If a, b in sequence, so is ab+5.
0

%I #5 Mar 30 2012 18:35:07

%S 2,9,23,51,86,107,177,212,219,359,429,443,464,534,723,779,863,891,933,

%T 968,1073,1178,1451,1563,1598,1731,1787,1871,1913,1941,1976,1983,2151,

%U 2361,2466,2606,2907,3131,3201,3236,3467,3579,3747,3831,3866,3887,3957

%N If a, b in sequence, so is ab+5.

%K nonn

%O 1,1

%A _David W. Wilson_