A018254 Divisors of 28.

1, 2, 4, 7, 14, 28

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(n-1). - Reinhard Zumkeller, Jun 21 2009

Mathematica

Divisors[28] (* Harvey P. Dale, Jun 08 2022 *)

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