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Am. Math. Monthly 116/4 (2009), 362-364.

20415 Geoffrey Berresford: A simpler proof of a well-known fact.
Am. Math. Monthly June 2008, 524. For a natural number n that is not
a perfect square, r=sqrt(n) is irrational. For if r=a/b with a,b
natural numbers with no common factors, then n/r=r, hence
a/b=r=n/r=nb/a. Since a and b have no common factors, this implies
that there exists a natural number k such that a=bk (looking
at the denominators!) and therefore r=a/b=k is a natural number.

20419 Rajendra Bhatia/J. Dias da Silva: Infinite divisibility of
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11445 Keith Brown: On general palindromic numbers. Internet 1997, 4p.

24747 Simon Colton/Alan Bundy/Toby Walsh: Automatic invention of integer
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John Horton Conway/Richard Guy: The book of numbers. Springer 1996, 310p. Eur 15.

23719 Jean-Marie De Koninck: Those fascinating numbers. AMS 2009, 430p. Eur 48.

23668 Philippe Ellia: Problemi risolti ed irrisolti in teoria dei numeri. Internet 2013, 20p.

27567 Mario Fiorentini/Ennio Peres: Zero, uno, infinito. Iacobelli 2018, 190p. Eur 16.

25297 Zachary Franco/Carl Pomerance: On a conjecture of Crandall concerning
the qx+1 problem. Math. Comp. 64/211 (1995), 1333-1336.

27263 Nicolas Gauvrit/Jean-Paul Delahaye/Hector Zenil: Sloane's gap - do mathematical
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24755 Brian Hayes: A question of numbers. Am. Scientist 84 (1996), 10-15.

18813 Günter Köhler/Jürgen Spilker: Endziffernblöcke von Potenzen.
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5008 Walter Kraemer: Numerische Berechnung von Schranken fuer \pi.
4731 Chatterji/, 57-72.

24756 Peter Liu: Efficient recognition of integer sequences.
Master's Essay Univ. Waterloo 1994, 43p.

27354 Andreas Loos: Was finden Sie schöner - 2,3,5,7,11 oder 0,1,1,2,3,5?
[Über Neal Sloanes OEIS.] Die Zeit 15. März 2018, 2p.

10817 Dana Mackenzie: Fractions to make an Egyptian scribe blanch.
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23728 Aimeric Malter/Dierk Schleicher/Don Zagier: New looks on old number theory.
Am. Math. Monthly 120/3 (2013), 243-264.

24221 Victor Moll: Numbers and functions. AMS 2012, 500p. Eur 46.

3544 Kenji Nagasaka/Etienne Fouvry (ed.): Analytic number theory.
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24757 Hieu Nguyen/Douglas Taggart: Mining the Online Encyclopedia of
Integer Sequences. Internet 2013, 14p.

22779 Clifford Pickover: Wonders of numbers. Oxford UP 2002, 400p. Eur 19.

23716 Fernando Rodriguez Villegas: Experimental number theory.
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5080 Wilhelm Singhof: Einige Beziehungen zwischen stabiler Homotopietheorie 
und Zahlentheorie. Jber. DMV 91 (1989), 55-66.

Neil Sloane: A handbook of integer sequences. Academic Press 1973.

24751 Neil Sloane: Introductory chapters to "A handbook of integer sequences".
Academic Press 1973, 32p.

24748 Neil Sloane. The On-line Encyclopedia of Integer Sequences.
Notices AMS September 2003, 913-916.

24749 Neil Sloane. The On-line Encyclopedia of Integer Sequences.
Internet 2012, 15p.

24209 Neil Sloane: Recent and noteworthy sequences in the OEIS.
Internet 2013, 15p.

27498 Neil Sloane: The On-Line Encyclopedia of Integer Sequences.
Notices AMS October 2018, 1062-1074.
24752 Neil Sloane/Simon Plouffe: Introductory chapters to
"The encyclopedia of integer sequences". Academic Press 1995, 42p.

24771 Neil Sloane/Simon Plouffe: The encyclopedia of integer sequences.
Academic Press 1995, 590p. Eur 78.

25363 Liz Strachan: Numbers are forever. Constable 2013, 270p. Eur 13.

2058 L. Toth: The unitary analogue of Pillai's arithmetical function.
Collect. Math. 40 (1989), 19-30.