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A202266 Composite numbers in which all substrings and reversal substrings are composites. 3

%I

%S 4,6,8,9,44,46,48,49,64,66,68,69,84,86,88,94,96,99,444,446,448,464,

%T 466,468,469,484,486,488,494,496,644,646,648,649,664,666,668,669,684,

%U 686,688,694,696,699,844,846,848,849,864,866,868,869,884,886,888,946,948

%N Composite numbers in which all substrings and reversal substrings are composites.

%C Subsequence of A202265, A202262.

%e All substrings and reversal substrings of 446 are composites: 4, 6, 44, 46, 64, 446, 644.

%Y Cf. A202263 (primes in which all substrings and reversal substrings are primes), A202264 (noncomposite numbers in which all substrings and reversal substrings are noncomposite), A202265 (nonprimes in which all substrings and reversal substrings are nonprimes).

%K nonn,base

%O 1,1

%A _Jaroslav Krizek_, Dec 25 2011

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Last modified April 25 11:43 EDT 2019. Contains 322456 sequences. (Running on oeis4.)