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A091462 Sum from 3 to a(n) of 1/(3k) exceeds n. 2
33, 681, 13650, 274140, 5506263, 110596236, 2221384803, 44617706493 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..8.

FORMULA

a(n) = 3*A002387(3n).

The next term is approximately the previous term * e^3.

MATHEMATICA

s = 0; k = 3; Do[ While[s = N[s + 1/k, 24]; s <= n, k += 3]; Print[k]; k += 3, {n, 1, 12}]

CROSSREFS

Cf. A002387, A056053, A056054, A091463, A091464.

Sequence in context: A094760 A083956 A164761 * A028210 A028205 A028191

Adjacent sequences:  A091459 A091460 A091461 * A091463 A091464 A091465

KEYWORD

nonn

AUTHOR

Robert G. Wilson v, Jan 12 2004

STATUS

approved

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Last modified December 7 17:16 EST 2016. Contains 278890 sequences.