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%I #6 Mar 31 2012 13:46:52
%S 12,18,21,34,65,67,81,92,98,102,108,138,150,180,192,198,225,231,279,
%T 310,314,334,350,356,370,376,386,405,435,453,483,495,504,552,582,607,
%U 613,625,637,647,653,667,726,750,780,819,831,920,928,938,962,1020,1032,1050
%N Numbers n such that both n plus its first digit and n minus its first digit are primes.
%C Average of pairs: 66,3255,3465,6696,6786,6954,9429,31725,34845,60096,...
%t Select[ Range[1060], PrimeQ[ # + IntegerDigits[ # ][[1]]] && PrimeQ[ # - IntegerDigits[ # ][[1]]] &]
%Y Intersection of A107835 & A107836.
%K base,nonn
%O 1,1
%A _Eric Angelini_ and _Robert G. Wilson v_, Jun 14 2005