Search: id:A032682
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%I A032682
%S A032682 0,3,5,8,9,15,17,18,20,23,29,30,32,36,38,45,47,48,51,53,57,60,62,72,
%T A032682 74,80,81,83,86,87,90,93,95,107,113,116,117,125,126,131,132,135,141,
%U A032682 147,149,155,162,168,170,173,180,182,183,194,197,198,201,204,207,210
%N A032682 Numbers n such that n surrounded by digit '1' is a prime.
%p A032682 t0:=[]; u0:=[]; for n from 1 to 100 do t1:=cat(1,n,1); t1:=convert(t1,
               decimal,10); if isprime(t1) then t0:=[op(t0),n]; u0:=[op(u0),t1]; 
               fi; od: t0;
%Y A032682 The primes are in A099677. Cf. A032686.
%Y A032682 Sequence in context: A137319 A138808 A018804 this_sequence A022769 A067241 
               A120943
%Y A032682 Adjacent sequences: A032679 A032680 A032681 this_sequence A032683 A032684 
               A032685
%K A032682 nonn,base
%O A032682 1,2
%A A032682 Patrick De Geest (pdg(AT)worldofnumbers.com), May 15, 1998.

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