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A091897 Numbers that remain prime or composite for all permutations of their digits. 2
2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 15, 17, 18, 21, 22, 24, 25, 26, 27, 28, 31, 33, 36, 37, 39, 40, 42, 44, 45, 46, 48, 49, 51, 52, 54, 55, 56, 57, 58, 60, 62, 63, 64, 65, 66, 68, 69, 71, 72, 73, 75, 77, 78, 79, 80, 81, 82, 84, 85, 86, 87, 88, 90, 93, 94, 96, 97, 99, 102, 105 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Union of A003459 and A067012. The repdigit numbers (A010785) > 1 are also clearly a subsequence.

LINKS

Table of n, a(n) for n=1..71.

CROSSREFS

Cf. A003459 (absolute primes), A067012 ('absolute composites'), A091898 (complement of A091897), A010785 (repdigit numbers).

Sequence in context: A318735 A002244 A037173 * A055201 A213006 A072303

Adjacent sequences:  A091894 A091895 A091896 * A091898 A091899 A091900

KEYWORD

base,nonn

AUTHOR

Rick L. Shepherd, Feb 09 2004

STATUS

approved

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Last modified April 8 04:26 EDT 2020. Contains 333312 sequences. (Running on oeis4.)