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A002459

Nearest integer to cosh(n).

1, 2, 4, 10, 27, 74, 202, 548, 1490, 4052, 11013, 29937, 81377, 221207, 601302, 1634509, 4443055, 12077476, 32829985, 89241150, 242582598, 659407867, 1792456423, 4872401723, 13244561065, 36002449669, 97864804714, 266024120301, 723128532146, 1965667148572

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OFFSET

0,2

REFERENCES

K. Hayashi, Sieben- und Mehrstellige Tafeln der Kreis- und Hyperbelfunktionen und deren Produkte Sowie der Gammafunktion. Springer-Verlag, Berlin, 1926.

A. V. Lebedev and R. M. Fedorova, A Guide to Mathematical Tables. Pergamon, Oxford, 1960, p. 93.

N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

T. D. Noe, Table of n, a(n) for n=0..150

FORMULA

|a(n) - A000495(n)| <= 1. - R. J. Mathar, Oct 28 2008

MAPLE

Digits := 50: [ seq( round(evalf(cosh(n))), n=0..35) ];

MATHEMATICA

Round[Cosh[Range[0, 40]]] (* Harvey P. Dale, Jan 08 2014 *)

CROSSREFS