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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A108957 Values of n such that n - 2^k is deficient for all 1 <= 2^k < n. 0
2, 3, 4, 5, 6, 9, 11, 12, 15, 17, 18, 23, 27, 33, 35, 39, 45, 47, 51, 53, 54, 59, 63, 65, 66, 69, 75, 77, 83, 87, 93, 95, 99, 107, 111, 117, 119, 123, 125, 126, 129, 131, 135, 137, 138, 143, 147, 149, 150, 153, 155, 159, 165, 167, 171, 173, 174, 179, 183, 185, 186 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Conjectures: a. Sequence is infinite. b. There are infinitely many consecutive pairs, such as (5:6), (11:12), (17:18), (53:54), ... (204005:204006).

LINKS

Table of n, a(n) for n=1..61.

EXAMPLE

53 is a term because 52, 51, 49, 45, 37 and 21 are all deficient numbers.

CROSSREFS

Cf. A005100, A039669.

Sequence in context: A240093 A286421 A116546 * A080112 A123924 A252484

Adjacent sequences:  A108954 A108955 A108956 * A108958 A108959 A108960

KEYWORD

easy,nonn

AUTHOR

Jason Earls, Jul 22 2005

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
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 24 14:49 EDT 2019. Contains 323532 sequences. (Running on oeis4.)