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A067942
Let rep(n) be the n-th repunit number; sequence gives values of n such that rep(n) == rep(9) (mod n).
0
1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 15, 16, 18, 20, 21, 24, 25, 30, 32, 33, 36, 39, 40, 45, 48, 50, 55, 60, 63, 64, 72, 73, 75, 80, 90, 96, 99, 100, 101, 105, 111, 117, 120, 125, 128, 137, 144, 150, 153, 160, 164, 165, 171, 180, 192, 195, 200, 207, 222, 225, 231, 240
OFFSET
1,2
CROSSREFS
Cf. A002275.
Sequence in context: A230780 A302540 A332487 * A130176 A156541 A325663
KEYWORD
easy,nonn
AUTHOR
Benoit Cloitre, Mar 05 2002
STATUS
approved