Daftar tetapan matematis
1900–1949

| Nama | Simbol | Ekspansi desimal | Rumus | Tahun | Himpunan |
| --- | --- | --- | --- | --- | --- |
| Tetapan Favard  |  {\frac {3}{4}}\zeta (2) | 1.23370 05501 36169 82735  |  {\frac {\pi ^{2}}{8}}=\sum _{n=0}^{\infty }{\frac {1}{(2n-1)^{2}}}={\frac {1}{1^{2}}}+{\frac {1}{3^{2}}}+{\frac {1}{5^{2}}}+{\frac {1}{7^{2}}}+\cdots  | 1902 hingga 1965 |  \mathbb {T}  |
| Sudut emas  |  {b} | 2.39996 32297 28653 32223  |  (4-2\,\Phi )\,\pi =(3-{\sqrt {5}})\,\pi =137.5077640500378546\dots ^{\circ } | 1907 |  \mathbb {T}  |
| Tetapan Sierpiński  |  {K} | 2.58498 17595 79253 21706  |  {\begin{aligned}\pi \left(2\gamma +\ln {\frac {4\pi ^{3}}{\Gamma ({\tfrac {1}{4}})^{4}}}\right)&=\pi (2\gamma +4\ln \Gamma ({\tfrac {3}{4}})-\ln \pi )\\&=\pi \left(2\ln 2+3\ln \pi +2\gamma -4\ln \Gamma ({\tfrac {1}{4}})\right)\end{aligned}} | 1907 |  |
| Tetapan Nielsen–Ramanujan  |  {\frac {{\zeta }(2)}{2}} | 0.82246 70334 24113 21823  |  {\frac {\pi ^{2}}{12}}=\sum _{n=1}^{\infty }{\frac {(-1)^{n+1}}{n^{2}}}={\frac {1}{1^{2}}}{-}{\frac {1}{2^{2}}}{+}{\frac {1}{3^{2}}}{-}{\frac {1}{4^{2}}}{+}{\frac {1}{5^{2}}}{-}\cdots  | 1909 |  \mathbb {T}  |
| Luas dari fraktal Mandelbrot  |  \gamma  | 1.5065918849 ± 0.0000000028  |  | 1912 |  |
| Tetapan Gieseking (de)  |  {\pi \ln \beta } | 1.01494 16064 09653 62502  |  {\begin{aligned}{\frac {3{\sqrt {3}}}{4}}\left(1-\sum _{n=0}^{\infty }{\frac {1}{(3n+2)^{2}}}+\sum _{n=1}^{\infty }{\frac {1}{(3n+1)^{2}}}\right)&={\frac {3{\sqrt {3}}}{4}}\left(1-{\frac {1}{2^{2}}}+{\frac {1}{4^{2}}}-{\frac {1}{5^{2}}}+{\frac {1}{7^{2}}}-{\frac {1}{8^{2}}}+{\frac {1}{10^{2}}}\pm \cdots \right)\end{aligned}} | 1912 |  |
| Tetapan Bernstein  |  {\beta } | 0.28016 94990 23869 13303  |  \approx {\frac {1}{2{\sqrt {\pi }}}} | 1913 |  |
| Tetapan bilangan prima kembar  |  {C}_{2} | 0.66016 18158 46869 57392  |  \prod _{p=3}^{\infty }{\frac {p(p-2)}{(p-1)^{2}}} | 1922 |  |
| Bilangan plastik  |  {\rho } | 1.32471 79572 44746 02596  |  {\sqrt[{3}]{1+\!{\sqrt[{3}]{1+\!{\sqrt[{3}]{1+\cdots }}}}}}=\textstyle {\sqrt[{3}]{{\frac {1}{2}}+{\frac {\sqrt {69}}{18}}}}+{\sqrt[{3}]{{\frac {1}{2}}-{\frac {\sqrt {69}}{18}}}} | 1929 |  \mathbb {A}  |
| Tetapan Bloch–Landau  |  {L} | 0.54325 89653 42976 70695  |  ={\frac {\Gamma ({\tfrac {1}{3}})\;\Gamma ({\tfrac {5}{6}})}{\Gamma ({\tfrac {1}{6}})}}={\frac {(-{\tfrac {2}{3}})!\;(-1+{\tfrac {5}{6}})!}{(-1+{\tfrac {1}{6}})!}} | 1929 |  |
| Tetapan Golomb–Dickman  |  {\lambda } | 0.62432 99885 43550 87099  |  \int \limits _{0}^{\infty }{\underset {{\text{Para }}x>2}{{\frac {f(x)}{x^{2}}}\,\mathrm {d} x}}=\int \limits _{0}^{1}e^{\operatorname {Li} (n)}\mathrm {d} ndimana  \operatorname {Li}  adalah integral logaritmik. | 1930 dan 1964 |  |
| Tetapan Feller–Tornier  |  {{\mathcal {C}}_{_{FT}}} | 0.66131 70494 69622 33528  |  {\underset {p_{n}:\,{prime}}{{\frac {1}{2}}\prod _{n=1}^{\infty }\left(1-{\frac {2}{p_{n}^{2}}}\right){+}{\frac {1}{2}}}}={\frac {3}{\pi ^{2}}}\prod _{n=1}^{\infty }\left(1-{\frac {1}{p_{n}^{2}-1}}\right){+}{\frac {1}{2}} | 1932 |  \mathbb {T} ? |
| Tetapan Champernowne basis 10 |  C_{10} | 0.12345 67891 01112 13141  |  \sum _{n=1}^{\infty }\;\sum _{k=10^{n-1}}^{10^{n}-1}{\frac {k}{10^{kn-9\sum _{j=0}^{n-1}10^{j}(n-j-1)}}} | 1933 |  \mathbb {T}  |
| Tetapan Gelfond–Schneider  |  G_{\,GS} | 2.66514 41426 90225 18865  |  2^{\sqrt {2}} | 1934 |  \mathbb {T}  |
| Tetapan Khinchin  |  K_{\,0} | 2.68545 20010 65306 44530  |  \prod _{n=1}^{\infty }\left[{1+{1 \over n(n+2)}}\right]^{\frac {\ln n}{\ln 2}} | 1934 |  \mathbb {T} ? |
| Tetapan Khinchin–Lévy |  {\beta } | 1.18656 91104 15625 45282  |  {\frac {\pi ^{2}}{12\,\ln 2}} | 1935 |  |
| Tetapan Khinchin–Lévy  |  e^{\beta } | 3.27582 29187 21811 15978  |  e^{\frac {\pi ^{2}}{12\ln 2}} | 1936 |  |
| Tetapan Mills  |  {\theta } | 1.30637 78838 63080 69046  |  \lfloor \theta ^{3^{n}}\rfloor  adalah prima. | 1947 |  |
| Tetapan Euler–Gompertz  |  {G} | 0.59634 73623 23194 07434  |  {\begin{aligned}\int \limits _{0}^{\infty }\!\!{\frac {e^{-n}}{1{+}n}}\,\mathrm {d} n&=\!\!\int \limits _{0}^{1}\!\!{\frac {1}{1{-}\ln n}}\,\mathrm {d} n\\&={\frac {1}{1+{\frac {1}{1+{\frac {1}{1+{\frac {2}{1+{\frac {2}{1+{\frac {3}{1+{\frac {3}{\ddots }}}}}}}}}}}}}}\end{aligned}} | Sebelum tahun 1948 |  |