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A202265 Nonprime numbers in which all substrings and reversal substrings are nonprimes. 6
0, 1, 4, 6, 8, 9, 10, 18, 40, 44, 46, 48, 49, 60, 64, 66, 68, 69, 80, 81, 84, 86, 88, 90, 94, 96, 99, 100, 108, 180, 184, 186, 400, 404, 406, 408, 440, 444, 446, 448, 460, 464, 466, 468, 469, 480, 481, 484, 486, 488, 490, 494, 496, 498, 600, 604, 606, 608, 609 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Subsequence of A062115, A202259.

Supersequence of A202266.

LINKS

Table of n, a(n) for n=1..59.

EXAMPLE

All substrings and reversal substrings of 186 are nonprimes: 1, 6, 8, 18, 68, 81, 86, 186, 681.

CROSSREFS

Cf. A202263 (primes in which all substrings and reversal substrings are primes),  A068669 (noncomposite numbers in which all substrings and reversal substrings are noncomposites), A202266 (composite numbers in which all substrings and reversal substrings are composites).

Sequence in context: A072362 A278948 A084988 * A004716 A212372 A320726

Adjacent sequences:  A202262 A202263 A202264 * A202266 A202267 A202268

KEYWORD

nonn,base

AUTHOR

Jaroslav Krizek, Dec 25 2011

STATUS

approved

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Last modified March 22 04:32 EDT 2019. Contains 321406 sequences. (Running on oeis4.)