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

 

Logo

Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing.
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A072832 First differences of Ulam's sequence A002858. 4
1, 1, 1, 2, 2, 3, 2, 3, 2, 8, 2, 8, 2, 9, 1, 5, 4, 5, 7, 3, 5, 5, 5, 10, 2, 3, 4, 8, 12, 5, 7, 7, 3, 7, 20, 2, 3, 2, 7, 8, 9, 3, 10, 2, 15, 2, 3, 2, 10, 5, 2, 13, 9, 27, 7, 3, 5, 15, 2, 15, 2, 5, 7, 12, 8, 10, 2, 7, 3, 2, 15, 2, 3, 7, 10, 5, 27, 2, 12, 5, 20, 2, 20, 2, 20, 2, 17, 17, 3, 2, 5, 12, 3 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

No pattern in this sequence has ever been observed, according to Finch.

In the first 49,999,999 terms, 1 occurs four times, 36.9% of the terms are 2, and some terms have not occurred. - Jud McCranie, Mar 02 2012

Even though some values seem to get larger as the sequence grows, it appears that the combined frequency of the values 2 and 3 approaches 50%.  This shows up even in the first 10000 terms (combined frequency: 49.9%). - Enrique Navarrete, May 08 2017

REFERENCES

Steven R. Finch, Mathematical Constants, Cambridge, 2003, pp. 145-151.

LINKS

Jud McCranie, Table of n, a(n) for n = 1..10000

Steven R. Finch, Stolarsky-Harborth Constant [Broken link]

Steven R. Finch, Stolarsky-Harborth Constant [From the Wayback machine]

CROSSREFS

Cf. A002858, A072540 (conjectured missing terms).

Sequence in context: A144910 A080330 A152872 * A080328 A245555 A031266

Adjacent sequences:  A072829 A072830 A072831 * A072833 A072834 A072835

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, Jul 25 2002

EXTENSIONS

More terms from Matthew Conroy, Aug 24 2002

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 December 10 12:43 EST 2019. Contains 329896 sequences. (Running on oeis4.)