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Theorem fmtnorn 47923
Description: A Fermat number is a function value of the enumeration of the Fermat numbers. (Contributed by AV, 3-Aug-2021.)
Assertion
Ref Expression
fmtnorn (𝐹 ∈ ran FermatNo ↔ ∃𝑛 ∈ ℕ0 (FermatNo‘𝑛) = 𝐹)
Distinct variable group:   𝑛,𝐹

Proof of Theorem fmtnorn
StepHypRef Expression
1 ovex 7403 . . 3 ((2↑(2↑𝑛)) + 1) ∈ V
2 df-fmtno 47917 . . 3 FermatNo = (𝑛 ∈ ℕ0 ↦ ((2↑(2↑𝑛)) + 1))
31, 2fnmpti 6645 . 2 FermatNo Fn ℕ0
4 fvelrnb 6904 . 2 (FermatNo Fn ℕ0 → (𝐹 ∈ ran FermatNo ↔ ∃𝑛 ∈ ℕ0 (FermatNo‘𝑛) = 𝐹))
53, 4ax-mp 5 1 (𝐹 ∈ ran FermatNo ↔ ∃𝑛 ∈ ℕ0 (FermatNo‘𝑛) = 𝐹)
Colors of variables: wff setvar class
Syntax hints:  wb 206   = wceq 1542  wcel 2114  wrex 3062  ran crn 5635   Fn wfn 6497  cfv 6502  (class class class)co 7370  1c1 11041   + caddc 11043  2c2 12214  0cn0 12415  cexp 13998  FermatNocfmtno 47916
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2709  ax-sep 5245  ax-nul 5255  ax-pr 5381
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2540  df-eu 2570  df-clab 2716  df-cleq 2729  df-clel 2812  df-nfc 2886  df-ne 2934  df-ral 3053  df-rex 3063  df-rab 3402  df-v 3444  df-dif 3906  df-un 3908  df-in 3910  df-ss 3920  df-nul 4288  df-if 4482  df-sn 4583  df-pr 4585  df-op 4589  df-uni 4866  df-br 5101  df-opab 5163  df-mpt 5182  df-id 5529  df-xp 5640  df-rel 5641  df-cnv 5642  df-co 5643  df-dm 5644  df-rn 5645  df-iota 6458  df-fun 6504  df-fn 6505  df-fv 6510  df-ov 7373  df-fmtno 47917
This theorem is referenced by:  prmdvdsfmtnof1lem2  47974  prmdvdsfmtnof  47975  prmdvdsfmtnof1  47976
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