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A074798 Floor of S*n^2, where S equals sum of reciprocal terms of this same sequence. 0
1, 5, 13, 23, 36, 52, 72, 94, 119, 147, 178, 211, 248, 288, 331, 376, 425, 476, 531, 588, 649, 712, 778, 847, 919, 994, 1072, 1153, 1237, 1324, 1414, 1507, 1602, 1701, 1803, 1907, 2014, 2125, 2238, 2354, 2474, 2596, 2721, 2849, 2980, 3114, 3251, 3391, 3533 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..49.

FORMULA

a(n) = floor(S*n^2), where S = sum_{k=1..inf} 1/a(k).

EXAMPLE

a(10) = 147 because a(10) = floor(S*10^2), where S = 1/1 + 1/5 + 1/13 + 1/23 + 1/36 + 1/52 + 1/72 +... + 1/a(k) +... {k=1..inf}.

S = 1.471869231468455847281... This should be good to about 20 digits. - David Einstein (Deinst(AT)world.std.com)

CROSSREFS

Sequence in context: A125830 A049882 A108195 * A031336 A099958 A213483

Adjacent sequences:  A074795 A074796 A074797 * A074799 A074800 A074801

KEYWORD

easy,nonn

AUTHOR

Paul D. Hanna, Sep 08 2002

STATUS

approved

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Last modified May 22 14:32 EDT 2019. Contains 323480 sequences. (Running on oeis4.)