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A331421 Decimal expansion of Sum_{n >= 2} (-1)^n/log_2(n). 1
6, 4, 0, 6, 7, 5, 8, 6, 7, 7, 5, 1, 9, 2, 7, 2, 9, 1, 2, 6, 5, 6, 1, 6, 6, 1, 1, 7, 9, 1, 7, 7, 7, 7, 7, 1, 9, 4, 5, 0, 7, 4, 9, 7, 2, 0, 0, 1, 9, 6, 4, 5, 0, 1, 9, 1, 0, 5, 3, 7, 9, 5, 7, 5, 5, 0, 4, 0, 6, 1, 3, 1, 9, 0, 3, 3, 9, 0, 8, 0, 8, 8, 1, 1, 4, 2, 1 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

A slowly converging series.

LINKS

Table of n, a(n) for n=0..86.

Daniel Hoyt, Python 3 program using series acceleration.

FORMULA

Equals A002162 * A099769. - M. F. Hasler, Jan 31 2020

EXAMPLE

0.64067586775192729126561661179177777...

PROG

(PARI) sumalt(k=2, (-1)^k/log(k))*log(2) \\ Edited by M. F. Hasler, Jan 31 2020

CROSSREFS

Cf. A002162, A099769, A257837, A257964, A257972, A257898, A257960, A257812.

Sequence in context: A190575 A189038 A097047 * A197581 A323525 A166978

Adjacent sequences:  A331418 A331419 A331420 * A331422 A331423 A331424

KEYWORD

nonn,cons

AUTHOR

Daniel Hoyt, Jan 16 2020

STATUS

approved

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Last modified January 18 14:07 EST 2021. Contains 340254 sequences. (Running on oeis4.)