982
248277212628384883047943066328546836223944311977655842794918993522521563237555
650145286211059365868171399984063710196404159462648235183782162356589166387664
599049458627927377620486160161495004228978098646407047162007645445619312738742
470000474

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The Lehmer constant to 1000 digits.

.59263271820163619710407860499570146908427540719716107109956260815824735236416
000851066478429710125705118718346542386963492602972067606827856079871979437487
251403403000583692486915538640614660348566823412154845636446642830937804980068
991183184965696172012113759470623436986514577152028677342172295805168234444776
889445080541632061558512323623064379170223520781603669639276342712524885456742
628397234194861141555441118656607347923877980434663425531692753922997364863485
871218333767125332765552976528666126066185788713622949403089031984313907958405
478989509947007489250053656329690017664408563598385209478301821868952137848984
967705787356537385497593520672298603936207528576177510978795686629351912784453
933568454874614667993688671835743937379165908437616570415794750776200309560115
740427603024939939214964193674171720654296953903175526951535843439567271915190
168880981717597249067581873559990538542690575895690162307174847972701860908496
99968957675960828498381969270404195036511309800972643309599823665

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Lemniscate constant or Gauss constant.

also known under this formula.

1/2*Pi^(3/2)/GAMMA(3/4)^2*2^(1/2);

also known under the same number divided by sqrt(2)--> 1.854...
see D.H. Lehmer The Lemniscate Constant : MTAC (or now MOC) vol 3. pp 550-551 (1948-49).
or Abramowitz and Stegun, Handbook of Mathematical Functions, p 658 formula 18.14.7
Dover Publication, New York 1964.

2.6220575542921198104648395898911194136827549514316231628168217038007905870704
142502302955329614290934461357526717832180556089569013939356947011194347752358
404226414971649069519368999799321460723831213908102062218974296008565545397723
05369549710288888325525

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The Lengyel constant.

1.09868580552518701

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The Levy constant.

3.275822918721811159787681882453843863608475525982374149405198924
190723215644960355181277540479174529492698526243401