login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A267697 Numbers with 7 odd divisors. 7
729, 1458, 2916, 5832, 11664, 15625, 23328, 31250, 46656, 62500, 93312, 117649, 125000, 186624, 235298, 250000, 373248, 470596, 500000, 746496, 941192, 1000000, 1492992, 1771561, 1882384, 2000000, 2985984, 3543122, 3764768, 4000000, 4826809, 5971968, 7086244, 7529536, 8000000, 9653618 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Positive integers that have exactly seven odd divisors.

Numbers n such that the symmetric representation of sigma(n) has 7 subparts. - Omar E. Pol, Dec 28 2016

LINKS

Table of n, a(n) for n=1..36.

FORMULA

A001227(a(n)) = 7.

PROG

(PARI) isok(n) = sumdiv(n, d, (d%2)) == 7; \\ Michel Marcus, Apr 03 2016

CROSSREFS

Column 7 of A266531.

Cf. A001227, A038547, A236104, A237593, A279387.

Numbers with k odd divisors (k = 1..10): A000079, A038550, A072502, apparently A131651, A267696, A230577, this sequence, A267891, A267892, A267893.

Sequence in context: A046319 A119710 A043455 * A232925 A255112 A255627

Adjacent sequences:  A267694 A267695 A267696 * A267698 A267699 A267700

KEYWORD

nonn

AUTHOR

Omar E. Pol, Apr 03 2016

EXTENSIONS

More terms from Michel Marcus, Apr 03 2016

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified May 25 04:36 EDT 2017. Contains 287008 sequences.