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A070330 Nontrivial numbers in which suffixing or inserting a 0 anywhere yields only composite numbers. 0

%I

%S 7,23,29,31,43,47,73,77,83,91,101,103,107,127,143,157,173,199,209,221,

%T 233,241,247,251,257,259,271,307,313,317,343,353,359,373,377,391,409,

%U 431,433,437,439,443,461,467,469,487,497,527,541,563,569,583,589,601

%N Nontrivial numbers in which suffixing or inserting a 0 anywhere yields only composite numbers.

%C This excludes numbers with sum of the digits == 0 mod 3, even numbers, or numbers == 5 (mod 10).

%Y Cf. A070331.

%K base,nonn

%O 0,1

%A _Amarnath Murthy_, May 11 2002

%E More terms from _Sascha Kurz_, Feb 01 2003

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Last modified July 28 11:21 EDT 2021. Contains 346326 sequences. (Running on oeis4.)