A fairly arbitrary selection of comments received in the past 40 years on different versions of the Encyclopedia of Integer Sequences and Superseeker.
(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 others.- 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 on NET.
Cordially yours,
"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. Enchanting." 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. ..."- from 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 numbers, 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 number - 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
"John Conway calls The Encyclopedia `The best present I've had in years'... "
"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, April 1974.