This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A210974 Decimal expansion of the angle (in degrees) between an edge and (the normal of) a face of the regular tetrahedron. 2
 5, 4, 7, 3, 5, 6, 1, 0, 3, 1, 7, 2, 4, 5, 3, 4, 5, 6, 8, 4, 6, 2, 2, 9, 9, 9, 6, 6, 9, 9, 8, 1, 2, 1, 7, 9, 8, 1, 5, 0, 3, 4, 2, 1, 5, 5, 0, 4, 5, 3, 9, 7, 4, 1, 4, 4, 0, 8, 5, 5, 5, 3, 1, 7, 8, 0, 1, 9, 8, 7, 3, 2, 1, 9, 0 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 2,1 COMMENTS Also known as "magic angle", the angle t such that 3*(cos t)^2 - 1 = 0. See more comments in A195696. - Stanislav Sykora, Nov 14 2013 LINKS Wikipedia, Tetrahedron Wikipedia, Magic angle FORMULA A195696 times 180 divided through Pi, see A072097. EXAMPLE 54.7356103172453... degrees. MATHEMATICA RealDigits[t/.FindRoot[3Cos[t Degree]^2-1==0, {t, 54}, WorkingPrecision-> 120]][[1]] (* Harvey P. Dale, May 02 2014 *) PROG (PARI) acos(sqrt(1/3))*180/Pi \\ Charles R Greathouse IV, Nov 05 2017 CROSSREFS Cf. A195696 (in radians). Sequence in context: A199276 A293380 A021870 * A177161 A154776 A188932 Adjacent sequences:  A210971 A210972 A210973 * A210975 A210976 A210977 KEYWORD nonn,cons AUTHOR Omar E. Pol, Jul 17 2012 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified November 16 09:17 EST 2018. Contains 317268 sequences. (Running on oeis4.)