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Answer in 5 . 4 . 3 . 2 . 1 ..... ( 1 2 3 4 5) Uncwilly	2023-06-10 18:54 by retina	50	28,533
Carmichael multiples of odd cyclic numbers. Neptune	2023-06-08 17:26 by Neptune	0	102
Ponder This - June 2023 Xyzzy	2023-06-01 13:53 by Xyzzy	0	391
Find factors with k = 2^n - 1 = Mersenne prime Dobri	2023-05-17 08:59 by Dobri	4	907
Ponder This - May 2023 ( 1 2) Xyzzy	2023-05-13 12:56 by dg211	19	1,557
One third of an exponential ( 1 2 3 4 5) retina	2023-05-13 12:45 by Dobri	48	1,837
How many times can an integer be halved? ( 1 2 3) raresaturn	2023-05-10 04:18 by axn	26	764
A "Wordle-ish" game ( 1 2 3 4 5 ... Last Page) Neptune	2023-05-02 20:07 by SmartMersenne	204	7,282
Are any Mersenne factors 1 mod p^2? ( 1 2 3 4 5 ... Last Page) Andrew Usher	2023-05-01 21:14 by alpertron	76	13,432
Ponder This - April 2023 tgan	2023-04-20 04:07 by Max0526	7	1,472
Ponder This - March 2023 ( 1 2 3 4) Xyzzy	2023-04-13 14:25 by henryzz	36	4,379
squarewise concatanation for the win fatphil	2023-03-23 13:30 by Dr Sardonicus	7	950
Basketball free throw percent ( 1 2) petrw1	2023-02-16 20:00 by Dr Sardonicus	11	1,626
A dozen eggs costs $0.24 ( 1 2) retina	2023-02-11 05:07 by kriesel	15	906
Multiplicative prime number sets henryzz	2023-02-10 16:34 by Dr Sardonicus	6	570
Ponder This - February 2023 tgan	2023-02-07 19:22 by slandrum	2	565
Fun multiplicative sequence (help wanted) ( 1 2) oreotheory	2023-02-07 07:13 by oreotheory	14	2,587
Permutation of integers? oreotheory	2023-02-05 03:05 by oreotheory	2	452
Ponder This - December 2022 ( 1 2) tgan	2023-02-03 07:09 by Dieter	12	2,225
A teacher stands at the chalkboard ... Neptune	2023-02-02 06:36 by MooMoo2	9	1,111
Ponder This - January 2023 Xyzzy	2023-01-09 10:36 by Dieter	2	1,033
Is this is a new puzzle? ... ... [Ecclesiastes 1:10] ( 1 2 3) petrw1	2023-01-09 02:09 by chalsall	23	2,868
Unfortunate website titles petrw1	2022-12-28 03:49 by ATH	9	1,605
Team Painting MattcAnderson	2022-12-13 22:52 by petrw1	4	715
The Square-Sum problem ( 1 2 3 4) henryzz	2022-11-30 06:45 by oreotheory	35	27,354

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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