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Thread / Thread Starter	Last Post	Replies	Views
Sticky: Proposal for new subforum ( 1 2 3 4 5) ewmayer	2005-10-10 23:25 by ewmayer	49	30,232
Lucas–Lehmer test in reverse User140242	2023-05-29 19:26 by Batalov	9	544
What's known about Mersenne prime exponent composites? ( 1 2) jnml	2023-05-20 02:09 by bhelmes	15	1,280
Amazing pattern with -12 (was -3) ( 1 2 3 4) paulunderwood	2023-05-17 15:32 by paulunderwood	41	4,763
factoring Carmichael numbers (as a free service) ( 1 2 3 4 5 ... Last Page) paulunderwood	2023-05-17 12:57 by paulunderwood	130	5,870
PRP Test for Wagstaff and Mersenne prime ? kijinSeija	2023-05-14 20:34 by kijinSeija	6	731
Sieve Wheel ( 1 2) User140242	2023-04-22 13:09 by User140242	12	3,936
Ellipses and hyperbolas of decompositions of even numbers into pairs of prime numbers genabutov	2023-04-10 15:35 by genabutov	3	448
Computing Dedekind number D(9). ( 1 2) Teonum	2023-04-04 14:50 by charybdis	16	5,052
Cheap Cyclic Fermat's Tests ( 1 2) a1call	2023-03-17 01:26 by a1call	15	1,833
x^3-x*y^2-y^3 test paulunderwood	2023-03-16 08:32 by paulunderwood	8	777
Powers of integers that lack certain digits (or letters in their spelling) Stargate38	2023-03-08 16:22 by kruoli	4	443
Primes mod 4 race ATH	2023-03-05 19:36 by ATH	2	359
Alternative to LL ( 1 2 3 4) paulunderwood	2023-02-25 19:45 by paulunderwood	40	7,491
Mod x^2-b test paulunderwood	2023-02-23 01:07 by paulunderwood	0	248
Is there a form of primes similar to primorials but with the sum of primes? ( 1 2) hunson	2023-02-21 17:18 by Tyler Busby	16	1,270
Sieving vs. trial factoring bur	2023-02-19 20:45 by bur	4	366
Does there exist a principle within chaos? Neptune	2023-02-13 21:45 by chalsall	1	232
M77232917 RMLabrador	2023-02-05 21:02 by mart_r	7	566
Trouble With Comparisons at the Store ( 1 2) EdH	2023-02-04 14:25 by xilman	20	1,020
Formula for the term S_p-2 in Lucas-Lehmer primality test ( 1 2 3) User140242	2023-01-23 19:40 by User140242	24	2,978
Is division by zero theoretically possible? ( 1 2 3) MPrimeFinder	2023-01-23 01:10 by kruoli	23	1,448
Some heuristic of Mersenne primes exponent RMLabrador	2023-01-18 20:02 by RMLabrador	4	471
Search for programmers ( 1 2 3) SergeyT	2023-01-16 16:18 by Uncwilly	27	3,159
Mersenne exponents of the form 8k+7 kijinSeija	2023-01-14 15:35 by Dr Sardonicus	7	2,176
Mp mod D ( 1 2 3) User140242	2023-01-11 20:20 by User140242	32	4,725

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≠ ± ∓ ÷ × · − √ ‰ ⊗ ⊕ ⊖ ⊘ ⊙ ≤ ≥ ≦ ≧ ≨ ≩ ≺ ≻ ≼ ≽ ⊏ ⊐ ⊑ ⊒ ² ³ °
∠ ∟ ° ≅ ~ ‖ ⟂ ⫛
≡ ≜ ≈ ∝ ∞ ≪ ≫ ⌊⌋ ⌈⌉ ∘ ∏ ∐ ∑ ∧ ∨ ∩ ∪ ⨀ ⊕ ⊗ 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