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 A049471 Decimal expansion of tan(1). 13
 1, 5, 5, 7, 4, 0, 7, 7, 2, 4, 6, 5, 4, 9, 0, 2, 2, 3, 0, 5, 0, 6, 9, 7, 4, 8, 0, 7, 4, 5, 8, 3, 6, 0, 1, 7, 3, 0, 8, 7, 2, 5, 0, 7, 7, 2, 3, 8, 1, 5, 2, 0, 0, 3, 8, 3, 8, 3, 9, 4, 6, 6, 0, 5, 6, 9, 8, 8, 6, 1, 3, 9, 7, 1, 5, 1, 7, 2, 7, 2, 8, 9, 5, 5, 5, 0, 9, 9, 9, 6, 5, 2, 0, 2, 2, 4, 2, 9, 8 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS By the Lindemann-Weierstrass theorem, this constant is transcendental. - Charles R Greathouse IV, May 13 2019 LINKS Harry J. Smith, Table of n, a(n) for n = 1..20000 Mohammad K. Azarian, Forty-Five Nested Equilateral Triangles and cosecant of 1 degree, Problem 813, College Mathematics Journal, Vol. 36, No. 5, November 2005, pp. 413-414. Mohammad K. Azarian, Solution of Forty-Five Nested Equilateral Triangles and cosecant of 1 degree, Problem 813, College Mathematics Journal, Vol. 37, No. 5, November 2006, pp. 394-395. FORMULA Equals Sum_{k>=1} (-1)^(k+1) * B(2*k) * 2^(2*k) * (2^(2*k) - 1) / (2*k)!, where B(k) is the k-th Bernoulli number. - Amiram Eldar, May 15 2021 EXAMPLE 1.5574077246549022305... MATHEMATICA RealDigits[Tan[1], 10, 100][[1]] (* Amiram Eldar, May 15 2021 *) PROG (PARI) default(realprecision, 20080); x=tan(1); for (n=1, 20000, d=floor(x); x=(x-d)*10; write("b049471.txt", n, " ", d)); \\ CROSSREFS Cf. A093178 (continued fraction), A009001, A073449. Sequence in context: A061382 A113272 A222392 * A049789 A234473 A011500 Adjacent sequences:  A049468 A049469 A049470 * A049472 A049473 A049474 KEYWORD cons,easy,nonn AUTHOR Albert du Toit (dutwa(AT)intekom.co.za), N. J. A. Sloane STATUS approved

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Last modified May 16 15:15 EDT 2022. Contains 353706 sequences. (Running on oeis4.)