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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Sequence is finite with 17 terms.

Supersequence of A202263, A085823.

Subsequence of A068669, A012883, A024770, A012883.

LINKS

Table of n, a(n) for n=1..17.

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

Adjacent sequences:  A202261 A202262 A202263 * A202265 A202266 A202267

KEYWORD

nonn,base,fini,full

AUTHOR

Jaroslav Krizek, Dec 25 2011

STATUS

approved

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Last modified April 22 14:33 EDT 2019. Contains 322356 sequences. (Running on oeis4.)