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Thread / Thread Starter	Last Post	Replies	Views
March 2023 ( 1 2 3) Xyzzy	2023-03-26 10:12 by Kebbaj	31	2,207
squarewise concatanation for the win fatphil	2023-03-23 13:30 by Dr Sardonicus	7	653
Are any Mersenne factors 1 mod p^2? ( 1 2 3 4 5 ... Last Page) Andrew Usher	2023-03-07 04:22 by alpertron	68	10,542
Basketball free throw percent ( 1 2) petrw1	2023-02-16 20:00 by Dr Sardonicus	11	1,286
A dozen eggs costs $0.24 ( 1 2) retina	2023-02-11 05:07 by kriesel	15	582
Multiplicative prime number sets henryzz	2023-02-10 16:34 by Dr Sardonicus	6	370
February 2023 tgan	2023-02-07 19:22 by slandrum	2	365
Fun multiplicative sequence (help wanted) ( 1 2) oreotheory	2023-02-07 07:13 by oreotheory	14	2,051
Permutation of integers? oreotheory	2023-02-05 03:05 by oreotheory	2	305
December 2022 ( 1 2) tgan	2023-02-03 07:09 by Dieter	12	1,847
A teacher stands at the chalkboard ... Neptune	2023-02-02 06:36 by MooMoo2	9	831
Moved: Is division by zero theoretically possible? MPrimeFinder	-	-	-
January 2023 Xyzzy	2023-01-09 10:36 by Dieter	2	747
Is this is a new puzzle? ... ... [Ecclesiastes 1:10] ( 1 2 3) petrw1	2023-01-09 02:09 by chalsall	23	2,163
Unfortunate website titles petrw1	2022-12-28 03:49 by ATH	9	1,294
A "Wordle-ish" game ( 1 2 3 4) Neptune	2022-12-22 09:12 by SmartMersenne	43	3,151
Team Painting MattcAnderson	2022-12-13 22:52 by petrw1	4	510
The Square-Sum problem ( 1 2 3 4) henryzz	2022-11-30 06:45 by oreotheory	35	26,240
A graph theory (I think) problem ( 1 2) oreotheory	2022-11-29 20:39 by oreotheory	11	983
Prime 'anagrams' ( 1 2 3 4 5 ... Last Page) raresaturn	2022-11-26 01:56 by Batalov	66	4,505
Paterson primes henryzz	2022-11-10 14:14 by Dr Sardonicus	6	1,184
November 2022 tgan	2022-11-02 13:28 by Dr Sardonicus	8	1,292
October 2022 Xyzzy	2022-10-31 15:53 by Max0526	4	1,426
Multibase primes ( 1 2 3 4 5 ... Last Page) Citrix	2022-10-18 07:21 by fatphil	78	9,786
Invisible Handlebar Cube a1call	2022-10-18 04:24 by LaurV	1	285

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∠ ∟ ° ≅ ~ ‖ ⟂ ⫛
≡ ≜ ≈ ∝ ∞ ≪ ≫ ⌊⌋ ⌈⌉ ∘ ∏ ∐ ∑ ∧ ∨ ∩ ∪ ⨀ ⊕ ⊗ 𝖕 𝖖 𝖗 ⊲ ⊳
∅ ∖ ∁ ↦ ↣ ∩ ∪ ⊆ ⊂ ⊄ ⊊ ⊇ ⊃ ⊅ ⊋ ⊖ ∈ ∉ ∋ ∌ ℕ ℤ ℚ ℝ ℂ ℵ ℶ ℷ ℸ 𝓟
¬ ∨ ∧ ⊕ → ← ⇒ ⇐ ⇔ ∀ ∃ ∄ ∴ ∵ ⊤ ⊥ ⊢ ⊨ ⫤ ⊣ … ⋯ ⋮ ⋰ ⋱
∫ ∬ ∭ ∮ ∯ ∰ ∇ ∆ δ ∂ ℱ ℒ ℓ
𝛢𝛼 𝛣𝛽 𝛤𝛾 𝛥𝛿 𝛦𝜀𝜖 𝛧𝜁 𝛨𝜂 𝛩𝜃𝜗 𝛪𝜄 𝛫𝜅 𝛬𝜆 𝛭𝜇 𝛮𝜈 𝛯𝜉 𝛰𝜊 𝛱𝜋 𝛲𝜌 𝛴𝜎𝜍 𝛵𝜏 𝛶𝜐 𝛷𝜙𝜑 𝛸𝜒 𝛹𝜓 𝛺𝜔