A091897 - OEIS

A091897

Numbers that remain prime or composite for all permutations of their digits.

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 A068998

Adjacent sequences: A091894 A091895 A091896 * A091898 A091899 A091900

KEYWORD

base,nonn

AUTHOR

Rick L. Shepherd, Feb 09 2004

STATUS

approved