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Thread / Thread Starter	Last Post	Replies	Views
The Square-Sum problem ( 1 2 3 4) henryzz	2023-09-24 12:54 by HermannSW	41	30,649
Find unique 4-digit number abcd=a^b*c^d ( 1 2) HermannSW	2023-09-17 12:48 by HermannSW	19	707
Ponder This - September 2023 tgan	2023-09-06 06:07 by Dieter	4	886
Ponder This - August 2023 ( 1 2 3) Xyzzy	2023-08-21 18:51 by Kebbaj	23	3,582
Looking for answers on "the Hardest Logic Puzzle Ever" ( 1 2 3) mathassistant	2023-08-03 12:16 by uau	23	1,838
Ponder This - July 2023 Xyzzy	2023-07-27 12:38 by Dieter	6	1,403
Answer in 5 . 4 . 3 . 2 . 1 ..... ( 1 2 3 4 5 ... Last Page) Uncwilly	2023-07-27 05:33 by lavalamp	56	32,010
Help identifying this puzzle/problem? mrh	2023-07-10 23:10 by mrh	2	435
Something Simple, Perhaps storm5510	2023-06-27 13:19 by storm5510	4	570
Carmichael multiples of odd cyclic numbers. Neptune	2023-06-08 17:26 by Neptune	0	418
Ponder This - June 2023 Xyzzy	2023-06-01 13:53 by Xyzzy	0	803
Find factors with k = 2^n - 1 = Mersenne prime Dobri	2023-05-17 08:59 by Dobri	4	1,308
Ponder This - May 2023 ( 1 2) Xyzzy	2023-05-13 12:56 by dg211	19	2,226
One third of an exponential ( 1 2 3 4 5) retina	2023-05-13 12:45 by Dobri	48	2,713
How many times can an integer be halved? ( 1 2 3) raresaturn	2023-05-10 04:18 by axn	26	1,374
A "Wordle-ish" game ( 1 2 3 4 5 ... Last Page) Neptune	2023-05-02 20:07 by SmartMersenne	204	9,238
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	15,609
Ponder This - April 2023 tgan	2023-04-20 04:07 by Max0526	7	1,908
Ponder This - March 2023 ( 1 2 3 4) Xyzzy	2023-04-13 14:25 by henryzz	36	5,518
squarewise concatanation for the win fatphil	2023-03-23 13:30 by Dr Sardonicus	7	1,340
Basketball free throw percent ( 1 2) petrw1	2023-02-16 20:00 by Dr Sardonicus	11	2,089
A dozen eggs costs $0.24 ( 1 2) retina	2023-02-11 05:07 by kriesel	15	1,462
Multiplicative prime number sets henryzz	2023-02-10 16:34 by Dr Sardonicus	6	931
Ponder This - February 2023 tgan	2023-02-07 19:22 by slandrum	2	907
Fun multiplicative sequence (help wanted) ( 1 2) oreotheory	2023-02-07 07:13 by oreotheory	14	3,275

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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