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A202264
Noncomposite numbers in which all substrings and reversal substrings are noncomposites.
2
1, 2, 3, 5, 7, 11, 13, 17, 31, 37, 71, 73, 113, 131, 311, 313, 373
OFFSET
1,2
COMMENTS
Sequence is finite with 17 terms.
Supersequence of A202263, A085823.
Subsequence of A068669, A012883, A024770, A012883.
EXAMPLE
All substrings and reversal substrings of 311 are noncomposites: 1, 3, 11, 13, 31, 113, 311.
CROSSREFS
Cf. A202263 (primes in which all substrings and reversal substrings are primes), A202265 (nonprimes in which all substrings and reversal substrings are nonprimes), A202266 (composite numbers in which all substrings and reversal substrings are composites).
Sequence in context: A068652 A003459 A276132 * A253717 A186307 A321420
KEYWORD
nonn,base,fini,full
AUTHOR
Jaroslav Krizek, Dec 25 2011
STATUS
approved