Demonstration of the
On-Line Encyclopedia of Integer Sequences® (OEIS®)
Comments about the OEIS
A fairly arbitrary selection of comments
received in the past 40 years on different versions
of the Encyclopedia of Integer Sequences
(Color has been added for emphasis.)
... Having said this, I also say that I found your On-Line Encyclopedia
to be the most useful mathematical database on the web.
I compare it with databases such as MathSciNet and MATH (Zentralblatt), but
yours is more unique and contains more "math added value" than the
- email received December 1998
Because of its spectacular usefulness, I try, in my own
humble way, to contribute an epsilon to increasing its usefulness,
I'm [a] russian university teacher and system programmer.
- email from Nizhny Novgorod, Russia, April 1995
In school years I subscribed to "Quantum (Kvant)"
magazine and in one of articles found a reference
to your 1973-handbook.
In student years I ordered a microform of handbook. It's
interesting (perfect/amicable numbers, LIFE, polyomino ...).
I'm due 5 years on Internet and want to say, that site
with SEQUENCE SERVER is unparalleled phenomena
- Favorite quotation from a reader of the 1973 book:
"There's the Old Testament,
the New Testament, and The Handbook of Integer Sequences".
"I recently had the occasion to look for a sequence in your book.
It wasn't there.
I tried the sequence of first differences.
It was there and pointed me in the direction of the literature.
My congratulations and best wishes!
"... Our process of discovery consisted of generating these sequences
and then identifying them with the aid of
Sloane's Handbook of Integer Sequences. ..."
J. M. Borwein, P. R. Borwein and K. Dilcher, Pi, Euler numbers, and asymptotic
expansions, Amer. Math. Monthly, 96 (1989), 681-687.
"... I thought I had something new until your book sent me to the Riordan reference, where I found 80% of my results and so I abandoned the problem."
- from a graph theorist in Maryland
I thank you a ton for your time in helping me out.
My teacher will be real happy we found some more numbers to crunch.
Your web-site is well configurated and easy to use. It helped a great deal.
Good luck at AT&T and thanks again!
- from a high-school student
Thank you for your great work. I first found your database out of curiosity,
following some link in some internet resources.
But recently I was busy with enumerating all ordered n-tuples of
and after I devised a formula for the number of these tuples I looked it
up in your
database and found that is has a name "preferential arrangements" and
A000670. I also found some literature on this and related sequences...
Very interesting site by the way (I read of it in The Penguin Dictionary of
Curious and Interesting Numbers)
Superseeker is a marvelous tool!!! Congratulations!!!
- email from Switzerland, January 1998
The review by Richard K. Guy in The American Mathematical Monthly
(Volume 104, Number 2, Feb. 1997, pp. 180-184) begins:
"John Conway calls The Encyclopedia `The best present
I've had in years'... "
A Question of Numbers.
Fascinating review by Brian Hayes in American Scientist,
Vol. 84, No. 1, January-February 1996, pages 10-14.
Another fascinating review by J. M. Borwein and R. M. Corless
in SIAM Review.
One of the many reviews from the
Amazon.com web page:
Rating: "***** My God!"
Reviewer: You Seng Peng from Taipei, Taiwan. December 12, 1999.
"Since combinatorics is my major, this book fulfills my dream. It contains over 5000 sequences, from
famous Fibonacci to notorious 1,3,6,11,17,25,... (perfect ruler, general term still unknown), to nonsense
1,11,21,1211,111221,.. (every term describe the former term). Nearly every important integer
sequence in mathematics get a line here, with references. This is a dream book for combinatorics
specialists, a must for high-school teachers while doing some short essays with gifted students, a fun book
for mathematics fans, especially those like mathematical games."
"... I also found N. J. A. Sloane's A Handbook of Integer Sequences
to be an invaluable tool.
I shall say no more about this marvelous reference except that every
recreational mathematician should buy a copy forthwith."
- Martin Gardner, Scientific American, July 1974.
"Incomparable, eccentric, yet very useful.
Contains thousands of `well-defined and interesting'
infinite integer sequences
together with references for each.
Sequences are arranged lexicographically and
(to minimize errors) typeset from computer tape.
If you ever wondered what comes after 1, 2, 4, 8, 17, 35, 71, ... , this is the place to look it up''
- Lynn A. Steen, Telegraphic Review, American Mathematical Monthly,
Other readers have said things like
- "Bought your book and read it cover to cover...,"
- "Bless you for your Handbook of Integer Sequences,"
- "Purchased your indispensable Handbook of Integer Sequences,
which is getting a great deal of use, to the detriment of household
- "Your book is for sure! Thanks!"
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