

A018254


Divisors of 28.


11




OFFSET

1,2


COMMENTS

28 is the second perfect number A000396(2) and 7 is the second Mersenne prime A000668(2). For the structure of this sequence and its representation in base 2, see A135652.  Omar E. Pol, Mar 03 2008


LINKS

Table of n, a(n) for n=1..6.
Index entries for sequences related to divisors of numbers


FORMULA

a(n) = A161713(n1).  Reinhard Zumkeller, Jun 21 2009


PROG

(PARI) divisors(28) \\ Charles R Greathouse IV, Jun 21 2017


CROSSREFS

Cf. A000396, A000668, A135652.
Sequence in context: A094057 A119267 A144978 * A218341 A018660 A018692
Adjacent sequences: A018251 A018252 A018253 * A018255 A018256 A018257


KEYWORD

nonn,fini,full,easy


AUTHOR

N. J. A. Sloane.


STATUS

approved



