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 A216548 Decimal expansion of 4*Sum_{k=1..5000000} (-1)^(k-1)/(2k-1). 10
 3, 1, 4, 1, 5, 9, 2, 4, 5, 3, 5, 8, 9, 7, 9, 3, 2, 3, 8, 4, 6, 4, 6, 4, 3, 3, 8, 3, 2, 7, 9, 5, 0, 2, 7, 8, 4, 1, 9, 7, 1, 6, 9, 3, 9, 9, 3, 8, 7, 3, 0, 5, 8, 2, 0, 9, 7, 4, 9, 4, 1, 8, 2, 2, 3, 0, 7, 8, 1, 6, 4, 0, 7, 2, 9, 6, 6, 2, 8, 9, 9, 8, 6, 2, 7, 4, 9, 4, 2, 7, 2, 3, 4, 2, 1, 1, 7, 4, 6, 6, 7, 0, 4, 1, 1, 0, 0, 8, 6, 1, 2, 5, 4, 5, 2, 0, 6, 3, 7, 4, 7, 5, 7, 4, 8 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS An approximation to Pi. REFERENCES J. M. Borwein, P. B. Borwein and K. Dilcher, Pi, Euler numbers and asymptotic expansions, Amer. Math. Monthly, 96 (1989), 681-687. LINKS J. M. Borwein and R. M. Corless, "Review of ``An Encyclopedia of Integer Sequences'' by _N. J. A. Sloane_ and Simon Plouffe", SIAM Review, 38 (1996), 333-337. EXAMPLE 3.1415924535897932384646433832795027841971693993873058209749418223... CROSSREFS Cf. A000796, A216542, A013706, A216543, A216544, A216545, A013705, A216546, A216547, A216548. Cf. also A195793. Sequence in context: A216543 A152040 A013705 * A087478 A112602 A000796 Adjacent sequences:  A216545 A216546 A216547 * A216549 A216550 A216551 KEYWORD cons,nonn AUTHOR N. J. A. Sloane, Sep 08 2012 STATUS approved

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