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2-category 2-category-theory abelian-categories adjoint algebra algebraic algebraic-geometry algebraic-topology analysis analytic-geometry arithmetic arithmetic-geometry book bundles calculus categorical categories category category-theory chern-weil-theory cohesion cohesive-homotopy-type-theory cohomology colimits combinatorics complex complex-geometry computable-mathematics computer-science constructive cosmology definitions deformation-theory descent diagrams differential differential-cohomology differential-equations differential-geometry digraphs duality elliptic-cohomology enriched fibration foundation foundations functional-analysis functor gauge-theory gebra geometric-quantization geometry graph graphs gravity grothendieck group group-theory harmonic-analysis higher higher-algebra higher-category-theory higher-differential-geometry higher-geometry higher-lie-theory higher-topos-theory homological homological-algebra homotopy homotopy-theory homotopy-type-theory index-theory integration integration-theory k-theory lie-theory limits linear linear-algebra locale localization logic mathematics measure-theory modal modal-logic model model-category-theory monad monads monoidal monoidal-category-theory morphism motives motivic-cohomology nlab noncommutative noncommutative-geometry number-theory of operads operator operator-algebra order-theory pages pasting philosophy physics pro-object probability probability-theory quantization quantum quantum-field quantum-field-theory quantum-mechanics quantum-physics quantum-theory question representation representation-theory riemannian-geometry scheme schemes set set-theory sheaf simplicial space spin-geometry stable-homotopy-theory stack string string-theory superalgebra supergeometry svg symplectic-geometry synthetic-differential-geometry terminology theory topological topology topos topos-theory tqft type type-theory universal variational-calculus

1. • CommentRowNumber1.
   • CommentAuthornLab edit announcer
   • CommentTimeMay 18th 2025
   • PermaLink
   Author: nLab edit announcer
   Format: MarkdownItexstarting page on evil numbers in number theory Abe <a href="https://ncatlab.org/nlab/revision/evil+number/1">v1</a>, <a href="https://ncatlab.org/nlab/show/evil+number">current</a>

   starting page on evil numbers in number theory

   Abe

   v1, current

2. • CommentRowNumber2.
   • CommentAuthorUrs
   • CommentTimeMay 18th 2025
   • PermaLink
   Author: Urs
   Format: MarkdownItexI looked up why the term "evil number" was chosen. Apparently meant to be a pun on "even", with "odious" a pun on "odd". Would be good to add this info to the entry, for clarification, since readers will wonder. (Because that's how it goes with nonsensical yet attention-grabbing terminology: It takes attention away from the subject matter that it means to name.)

   I looked up why the term “evil number” was chosen. Apparently meant to be a pun on “even”, with “odious” a pun on “odd”.

   Would be good to add this info to the entry, for clarification, since readers will wonder.

   (Because that’s how it goes with nonsensical yet attention-grabbing terminology: It takes attention away from the subject matter that it means to name.)

3. • CommentRowNumber3.
   • CommentAuthornLab edit announcer
   • CommentTimeMay 18th 2025
   • PermaLink
   Author: nLab edit announcer
   Format: MarkdownItexadded the origin of "evil number" to the page and a reference for the claim * [[Jean-Paul Allouche]], [[Benoit Cloitre]], [[Vladimir Shevelev]], *Beyond odious and evil* &lbrack;[arXiv:1405.6214](https://arxiv.org/abs/1405.6214)&rbrack; Abe <a href="https://ncatlab.org/nlab/revision/diff/evil+number/2">diff</a>, <a href="https://ncatlab.org/nlab/revision/evil+number/2">v2</a>, <a href="https://ncatlab.org/nlab/show/evil+number">current</a>

   added the origin of “evil number” to the page and a reference for the claim

   • Jean-Paul Allouche, Benoit Cloitre, Vladimir Shevelev, Beyond odious and evil [arXiv:1405.6214]

   Abe

   diff, v2, current

4. • CommentRowNumber4.
   • CommentAuthornLab edit announcer
   • CommentTimeMay 18th 2025
   • PermaLink
   Author: nLab edit announcer
   Format: MarkdownItexAlso added reference * [[Elwyn R. Berlekamp]], [[John H. Conway]], [[Richard K. Guy]], *Winning Ways for Your Mathematical Plays*, Volume 1, 2nd ed., A K Peters, 2001, chapter 14, p. 110. &lbrack;ISBN:978-1568811307&rbrack; Abe <a href="https://ncatlab.org/nlab/revision/diff/evil+number/2">diff</a>, <a href="https://ncatlab.org/nlab/revision/evil+number/2">v2</a>, <a href="https://ncatlab.org/nlab/show/evil+number">current</a>

   Also added reference

   • Elwyn R. Berlekamp, John H. Conway, Richard K. Guy, Winning Ways for Your Mathematical Plays, Volume 1, 2nd ed., A K Peters, 2001, chapter 14, p. 110. [ISBN:978-1568811307]

   Abe

   diff, v2, current

5. • CommentRowNumber5.
   • CommentAuthorUrs
   • CommentTimeMay 18th 2025
   • PermaLink
   Author: Urs
   Format: MarkdownItexThanks! (Myself, can't easily edit much today, being on a plane.)

   Thanks!

   (Myself, can’t easily edit much today, being on a plane.)