A092630 - OEIS

%I #5 Mar 31 2012 14:40:00

%S 1,4,6,8,9,12,15,20,21,24,26,28,30,34,36,38,39,42,45,50,51,54,56,58,

%T 62,63,65,70,74,76,78,82,85,87,92,93,95,122,123,125,132,133,135,152,

%U 153,155,172,175,177,202,203,205,207,212,213,215,217,220,221,224,226,228

%N Nonprime numbers with exactly one nonprime digit.

%e 20 is nonprime and has one nonprime digit, 0;

%e 122 is nonprime and has one nonprime digit, 1.

%p stev_sez:=proc(n) local i, tren, st, ans, anstren; ans:=[ ]: anstren:=[ ]: tren:=n: for i while (tren>0) do st:=round( 10*frac(tren/10) ): ans:=[ op(ans), st ]: tren:=trunc(tren/10): end do; for i from nops(ans) to 1 by -1 do anstren:=[ op(anstren), op(i,ans) ]; od; RETURN(anstren); end: ts_stnepf:=proc(n) local i, stpf, ans; ans:=stev_sez(n): stpf:=0: for i from 1 to nops(ans) do if (isprime(op(i,ans))='false') then stpf:=stpf+1; # number of nonprime digits fi od; RETURN(stpf) end: ts_nepr_neprn:=proc(n) local i, stpf, ans, ans1, tren; ans:=[ ]: stpf:=0: tren:=1: for i from 1 to n do if ( isprime(i)='false' and ts_stnepf(i) = 1) then ans:=[ op(ans), i ]: tren:=tren+1; fi od; RETURN(ans) end: ts_nepr_neprn(1000);

%K nonn,base

%O 1,2

%A _Jani Melik_, Apr 11 2004