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Search: id:A143623
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| A143623 |
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Decimal expansion of the constant cos(1) + sin(1) = 1.38177 32906 ... . |
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+0
9
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| 1, 3, 8, 1, 7, 7, 3, 2, 9, 0, 6, 7, 6, 0, 3, 6, 2, 2, 4, 0, 5, 3, 4, 3, 8, 9, 2, 9, 0, 7, 3, 2, 7, 5, 6, 0, 3, 3, 5, 4, 8, 7, 3, 4, 8, 1, 4, 1, 6, 2, 9, 3, 2, 9, 3, 3, 4, 2, 8, 4, 8, 9, 6, 5, 3, 7, 3, 0, 1, 0, 7, 9, 9, 1, 6, 5, 7, 1, 1, 4, 3, 3, 4, 6, 6, 5, 9, 1, 5, 9, 9, 6, 3, 0, 2, 3, 5, 7, 8, 5, 1
(list; cons; graph; listen)
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OFFSET
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1,2
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COMMENT
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cos(1) + sin(1) = sum {n = 0.. inf} (-1)^floor(n/2)/n! = 1 + 1/1! - 1/2! - 1/3! + 1/4! + 1/5! - 1/6! - 1/7! + + - - ... . Define E_2(k) = sum {n = 0.. inf} (-1)^floor(n/2)*n^k/n! for k = 0,1,2,... . Then E_2(0) = cos(1) + sin(1) and E_2(1) = cos(1) - sin(1). Furthermore, E_2(k) is an integral linear combination of E_2(0) and E_2(1) (a Dobinski-type relation). For example, E_2(2) = E_2(1) - E_2(0), E_2(3) = -3*E_2(0) and E_2(4) = -5*E_2(1) - 6*E_2(0). The precise result is E_2(k) = A121867(k) * E_2(0) - A121868(k) * E_2(1). The decimal expansion of the constant cos(1) - sin(1) = E_2(1) is recorded in A143624. Compare with A143625.
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EXAMPLE
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cos(1) + sin(1) = 1.38177 32906 76036 22405 ... .
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CROSSREFS
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A049469, A049470, A057077, A121867, A121868, A143624, A143625.
Sequence in context: A013676 A131563 A016622 this_sequence A094874 A132338 A132702
Adjacent sequences: A143620 A143621 A143622 this_sequence A143624 A143625 A143626
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KEYWORD
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cons,easy,nonn
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AUTHOR
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Peter Bala (pbala(AT)toucansurf.com), Aug 30 2008
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EXTENSIONS
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Offset corrected by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 05 2009
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