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Are any Mersenne factors 1 mod p^2? ( 1 2 3 4 5) Andrew Usher	2023-01-21 14:00 by alpertron	52	5,695
Moved: Is division by zero theoretically possible? MPrimeFinder	-	-	-
Fun multiplicative sequence (help wanted) ( 1 2) oreotheory	2023-01-17 02:50 by Viliam Furik	13	1,549
January 2023 Xyzzy	2023-01-09 10:36 by Dieter	2	455
Is this is a new puzzle? ... ... [Ecclesiastes 1:10] ( 1 2 3) petrw1	2023-01-09 02:09 by chalsall	23	1,239
Unfortunate website titles petrw1	2022-12-28 03:49 by ATH	9	834
A "Wordle-ish" game ( 1 2 3 4) Neptune	2022-12-22 09:12 by SmartMersenne	43	2,420
December 2022 tgan	2022-12-16 01:03 by raresaturn	10	1,445
A teacher stands at the chalkboard ... Neptune	2022-12-14 21:29 by petrw1	6	523
Team Painting MattcAnderson	2022-12-13 22:52 by petrw1	4	321
The Square-Sum problem ( 1 2 3 4) henryzz	2022-11-30 06:45 by oreotheory	35	25,576
A graph theory (I think) problem ( 1 2) oreotheory	2022-11-29 20:39 by oreotheory	11	703
Prime 'anagrams' ( 1 2 3 4 5 ... Last Page) raresaturn	2022-11-26 01:56 by Batalov	66	3,863
Paterson primes henryzz	2022-11-10 14:14 by Dr Sardonicus	6	1,001
November 2022 tgan	2022-11-02 13:28 by Dr Sardonicus	8	1,204
October 2022 Xyzzy	2022-10-31 15:53 by Max0526	4	1,219
Multibase primes ( 1 2 3 4 5 ... Last Page) Citrix	2022-10-18 07:21 by fatphil	78	9,401
Invisible Handlebar Cube a1call	2022-10-18 04:24 by LaurV	1	245
Is (1 + 1 + 1 + 1 + 1 + 1 + ...) less than (1 + 2 + 3 + 4 + 5 + 6 + ...) ? ( 1 2 3 4) retina	2022-10-09 02:00 by MPrimeFinder	39	17,894
September 2022 Xyzzy	2022-10-03 22:23 by SmartMersenne	4	1,370
August 2022 ( 1 2) tgan	2022-09-05 17:50 by KangJ	12	2,840
Primes in π ( 1 2 3 4 5 ... Last Page) davar55	2022-08-20 21:20 by kruoli	219	67,407
Interesting meta variation on the Square-Sum Problem Angel	2022-08-07 13:03 by Angel	0	444
The chess puzzle that led to a Fields Medal hoppi	2022-08-04 15:45 by uau	8	1,459
July 2022 ( 1 2) Xyzzy	2022-07-27 00:06 by SmartMersenne	12	2,137

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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