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A109492 Divisors of 111111. 7
1, 3, 7, 11, 13, 21, 33, 37, 39, 77, 91, 111, 143, 231, 259, 273, 407, 429, 481, 777, 1001, 1221, 1443, 2849, 3003, 3367, 5291, 8547, 10101, 15873, 37037, 111111 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Note that the smaller repunits R3=111, R4=1111, R5=11111 are semiprimes and have only 4 divisors, which is again the case for the next repunit R7=1111111. - M. F. Hasler, Oct 13 2011

LINKS

Table of n, a(n) for n=1..32.

Eric Weisstein's World of Mathematics, Repunit

Index entries for sequences related to divisors of numbers

PROG

(PARI) divisors(111111) \\ Michel Marcus, Sep 08 2015

CROSSREFS

Cf. A070529, A018282, A018766, A027894, A027893, A027892, A027891, A027890, A027889, A027895. [M. F. Hasler, Oct 13 2011]

Cf. A199799 (totatives of 111111), A154549 (111111*n).

Sequence in context: A206943 A059054 A197318 * A176799 A310200 A095286

Adjacent sequences:  A109489 A109490 A109491 * A109493 A109494 A109495

KEYWORD

nonn,fini,full,easy

AUTHOR

Philippe Deléham, Aug 28 2005

STATUS

approved

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Last modified October 25 13:09 EDT 2021. Contains 348251 sequences. (Running on oeis4.)