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%I #6 Jan 05 2020 05:36:35
%S 8,9,12,14,16,20,22,26,30,32,34,35,36,38,39,44,45,48,50,51,55,56,58,
%T 62,65,68,72,74,77,78,80,84,85,86,87,90,92,93,95,96,98,100,104,108,
%U 110,111,112,114,116,119,121,122,124,125,126,128,133,134,135,140,141
%N Numbers m such that m and 10*m + 1 are both composites.
%C Corresponding values of 10*m + 1 are in A179444.
%H Andrew Howroyd, <a href="/A179443/b179443.txt">Table of n, a(n) for n = 1..1000</a>
%o (PARI) is(n)={n>1 && !isprime(n) && !isprime(10*n+1)}
%o select(is, [1..200]) \\ _Andrew Howroyd_, Jan 04 2020
%Y Cf. A179444.
%K nonn
%O 1,1
%A _Jaroslav Krizek_, Jul 14 2010
%E Terms a(43) and beyond from _Andrew Howroyd_, Jan 04 2020
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