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Mirrors > Home > MPE Home > Th. List > Mathboxes > fmtnoge3 | Structured version Visualization version GIF version |
Description: Each Fermat number is greater than or equal to 3. (Contributed by AV, 4-Aug-2021.) |
Ref | Expression |
---|---|
fmtnoge3 | ⊢ (𝑁 ∈ ℕ0 → (FermatNo‘𝑁) ∈ (ℤ≥‘3)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | fmtno 43698 | . 2 ⊢ (𝑁 ∈ ℕ0 → (FermatNo‘𝑁) = ((2↑(2↑𝑁)) + 1)) | |
2 | 3z 12018 | . . . 4 ⊢ 3 ∈ ℤ | |
3 | 2 | a1i 11 | . . 3 ⊢ (𝑁 ∈ ℕ0 → 3 ∈ ℤ) |
4 | 2nn0 11917 | . . . . . . 7 ⊢ 2 ∈ ℕ0 | |
5 | 4 | a1i 11 | . . . . . 6 ⊢ (𝑁 ∈ ℕ0 → 2 ∈ ℕ0) |
6 | id 22 | . . . . . . 7 ⊢ (𝑁 ∈ ℕ0 → 𝑁 ∈ ℕ0) | |
7 | 5, 6 | nn0expcld 13610 | . . . . . 6 ⊢ (𝑁 ∈ ℕ0 → (2↑𝑁) ∈ ℕ0) |
8 | 5, 7 | nn0expcld 13610 | . . . . 5 ⊢ (𝑁 ∈ ℕ0 → (2↑(2↑𝑁)) ∈ ℕ0) |
9 | peano2nn0 11940 | . . . . 5 ⊢ ((2↑(2↑𝑁)) ∈ ℕ0 → ((2↑(2↑𝑁)) + 1) ∈ ℕ0) | |
10 | 8, 9 | syl 17 | . . . 4 ⊢ (𝑁 ∈ ℕ0 → ((2↑(2↑𝑁)) + 1) ∈ ℕ0) |
11 | 10 | nn0zd 12088 | . . 3 ⊢ (𝑁 ∈ ℕ0 → ((2↑(2↑𝑁)) + 1) ∈ ℤ) |
12 | 3m1e2 11768 | . . . . 5 ⊢ (3 − 1) = 2 | |
13 | 2cn 11715 | . . . . . . 7 ⊢ 2 ∈ ℂ | |
14 | exp1 13438 | . . . . . . 7 ⊢ (2 ∈ ℂ → (2↑1) = 2) | |
15 | 13, 14 | ax-mp 5 | . . . . . 6 ⊢ (2↑1) = 2 |
16 | 2re 11714 | . . . . . . . . 9 ⊢ 2 ∈ ℝ | |
17 | 16 | a1i 11 | . . . . . . . 8 ⊢ (𝑁 ∈ ℕ0 → 2 ∈ ℝ) |
18 | 1le2 11849 | . . . . . . . . 9 ⊢ 1 ≤ 2 | |
19 | 18 | a1i 11 | . . . . . . . 8 ⊢ (𝑁 ∈ ℕ0 → 1 ≤ 2) |
20 | 17, 6, 19 | expge1d 13532 | . . . . . . 7 ⊢ (𝑁 ∈ ℕ0 → 1 ≤ (2↑𝑁)) |
21 | 1zzd 12016 | . . . . . . . 8 ⊢ (𝑁 ∈ ℕ0 → 1 ∈ ℤ) | |
22 | 7 | nn0zd 12088 | . . . . . . . 8 ⊢ (𝑁 ∈ ℕ0 → (2↑𝑁) ∈ ℤ) |
23 | 1lt2 11811 | . . . . . . . . 9 ⊢ 1 < 2 | |
24 | 23 | a1i 11 | . . . . . . . 8 ⊢ (𝑁 ∈ ℕ0 → 1 < 2) |
25 | 17, 21, 22, 24 | leexp2d 13618 | . . . . . . 7 ⊢ (𝑁 ∈ ℕ0 → (1 ≤ (2↑𝑁) ↔ (2↑1) ≤ (2↑(2↑𝑁)))) |
26 | 20, 25 | mpbid 234 | . . . . . 6 ⊢ (𝑁 ∈ ℕ0 → (2↑1) ≤ (2↑(2↑𝑁))) |
27 | 15, 26 | eqbrtrrid 5105 | . . . . 5 ⊢ (𝑁 ∈ ℕ0 → 2 ≤ (2↑(2↑𝑁))) |
28 | 12, 27 | eqbrtrid 5104 | . . . 4 ⊢ (𝑁 ∈ ℕ0 → (3 − 1) ≤ (2↑(2↑𝑁))) |
29 | 3re 11720 | . . . . . 6 ⊢ 3 ∈ ℝ | |
30 | 29 | a1i 11 | . . . . 5 ⊢ (𝑁 ∈ ℕ0 → 3 ∈ ℝ) |
31 | 1red 10645 | . . . . 5 ⊢ (𝑁 ∈ ℕ0 → 1 ∈ ℝ) | |
32 | 8 | nn0red 11959 | . . . . 5 ⊢ (𝑁 ∈ ℕ0 → (2↑(2↑𝑁)) ∈ ℝ) |
33 | 30, 31, 32 | lesubaddd 11240 | . . . 4 ⊢ (𝑁 ∈ ℕ0 → ((3 − 1) ≤ (2↑(2↑𝑁)) ↔ 3 ≤ ((2↑(2↑𝑁)) + 1))) |
34 | 28, 33 | mpbid 234 | . . 3 ⊢ (𝑁 ∈ ℕ0 → 3 ≤ ((2↑(2↑𝑁)) + 1)) |
35 | eluz2 12252 | . . 3 ⊢ (((2↑(2↑𝑁)) + 1) ∈ (ℤ≥‘3) ↔ (3 ∈ ℤ ∧ ((2↑(2↑𝑁)) + 1) ∈ ℤ ∧ 3 ≤ ((2↑(2↑𝑁)) + 1))) | |
36 | 3, 11, 34, 35 | syl3anbrc 1339 | . 2 ⊢ (𝑁 ∈ ℕ0 → ((2↑(2↑𝑁)) + 1) ∈ (ℤ≥‘3)) |
37 | 1, 36 | eqeltrd 2916 | 1 ⊢ (𝑁 ∈ ℕ0 → (FermatNo‘𝑁) ∈ (ℤ≥‘3)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1536 ∈ wcel 2113 class class class wbr 5069 ‘cfv 6358 (class class class)co 7159 ℂcc 10538 ℝcr 10539 1c1 10541 + caddc 10543 < clt 10678 ≤ cle 10679 − cmin 10873 2c2 11695 3c3 11696 ℕ0cn0 11900 ℤcz 11984 ℤ≥cuz 12246 ↑cexp 13432 FermatNocfmtno 43696 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1969 ax-7 2014 ax-8 2115 ax-9 2123 ax-10 2144 ax-11 2160 ax-12 2176 ax-ext 2796 ax-sep 5206 ax-nul 5213 ax-pow 5269 ax-pr 5333 ax-un 7464 ax-cnex 10596 ax-resscn 10597 ax-1cn 10598 ax-icn 10599 ax-addcl 10600 ax-addrcl 10601 ax-mulcl 10602 ax-mulrcl 10603 ax-mulcom 10604 ax-addass 10605 ax-mulass 10606 ax-distr 10607 ax-i2m1 10608 ax-1ne0 10609 ax-1rid 10610 ax-rnegex 10611 ax-rrecex 10612 ax-cnre 10613 ax-pre-lttri 10614 ax-pre-lttrn 10615 ax-pre-ltadd 10616 ax-pre-mulgt0 10617 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1539 df-ex 1780 df-nf 1784 df-sb 2069 df-mo 2621 df-eu 2653 df-clab 2803 df-cleq 2817 df-clel 2896 df-nfc 2966 df-ne 3020 df-nel 3127 df-ral 3146 df-rex 3147 df-reu 3148 df-rmo 3149 df-rab 3150 df-v 3499 df-sbc 3776 df-csb 3887 df-dif 3942 df-un 3944 df-in 3946 df-ss 3955 df-pss 3957 df-nul 4295 df-if 4471 df-pw 4544 df-sn 4571 df-pr 4573 df-tp 4575 df-op 4577 df-uni 4842 df-iun 4924 df-br 5070 df-opab 5132 df-mpt 5150 df-tr 5176 df-id 5463 df-eprel 5468 df-po 5477 df-so 5478 df-fr 5517 df-we 5519 df-xp 5564 df-rel 5565 df-cnv 5566 df-co 5567 df-dm 5568 df-rn 5569 df-res 5570 df-ima 5571 df-pred 6151 df-ord 6197 df-on 6198 df-lim 6199 df-suc 6200 df-iota 6317 df-fun 6360 df-fn 6361 df-f 6362 df-f1 6363 df-fo 6364 df-f1o 6365 df-fv 6366 df-riota 7117 df-ov 7162 df-oprab 7163 df-mpo 7164 df-om 7584 df-2nd 7693 df-wrecs 7950 df-recs 8011 df-rdg 8049 df-er 8292 df-en 8513 df-dom 8514 df-sdom 8515 df-pnf 10680 df-mnf 10681 df-xr 10682 df-ltxr 10683 df-le 10684 df-sub 10875 df-neg 10876 df-div 11301 df-nn 11642 df-2 11703 df-3 11704 df-n0 11901 df-z 11985 df-uz 12247 df-rp 12393 df-seq 13373 df-exp 13433 df-fmtno 43697 |
This theorem is referenced by: fmtnonn 43700 prmdvdsfmtnof 43755 prmdvdsfmtnof1 43756 |
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