Search: id:A118497
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%I A118497
%S A118497 34,16,37,97,79,301,151,361,371,391,322,922,142,172,772,382,313,133,943,
%T A118497 763,373,383,793,124,334,934,754,364,325,745,395,106,706,316,916,346,
%U A118497 166,376,196,907,727,337,937,757,377,328,358,958,388,709,929,769,799
%N A118497 Primes that are not Chen primes written backwards.
%p A118497 # Check if number is Chen prime ischenprime:=proc(n); if (isprime(n) 
               = 'true') then if (isprime(n+2) = 'true' or numtheory[bigomega](n+2) 
               = 2) then return 'true' else return 'false' fi fi end: #Reverse digits 
               obrni_stev:=proc(n) local i, tren, tren1, st, ans; ans:=[ ]: tren:=n: 
               tren1:=0: for i while (tren>0) do st:=round(10*frac(tren/10)): ans:=[op(ans), 
               st]: tren:=trunc(tren/10): od: for i from 0 to nops(ans)-1 do tren1:= 
               tren1 + op(nops(ans)-i, ans)*10^(i): od: return tren1 end: ts_inv_nonchen_pra:= 
               proc(n) local i, trens, ans; trens:= [ ]; ans:=[ ]; for i from 1 
               to n do if (ischenprime( i ) = 'false') then ans:=[op(ans),obrni_stev(i)] 
               fi: od: return ans end: ts_inv_nonchen_pra(2000);
%Y A118497 Cf. A004087, A102540, A109611.
%Y A118497 Sequence in context: A037933 A098765 A071788 this_sequence A033354 A033972 
               A114031
%Y A118497 Adjacent sequences: A118494 A118495 A118496 this_sequence A118498 A118499 
               A118500
%K A118497 nonn,base,less
%O A118497 1,1
%A A118497 Jani Melik (jani_melik(AT)hotmail.com), May 05 2006

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