The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A227689 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A227689

a(n) is the least integer k such that 2^k - 1 has at least 10^n digits.
(history; published version)

#28 by Alois P. Heinz at Mon Jun 28 12:05:41 EDT 2021

STATUS

editing

approved

#27 by Alois P. Heinz at Mon Jun 28 12:04:23 EDT 2021

FORMULA

Limit_{n -> infinityoo} a(n)/10^n = log_2(10) = A020862. - Alois P. Heinz, Jun 28 2021

#26 by Alois P. Heinz at Mon Jun 28 12:03:38 EDT 2021

FORMULA

Limit_{n -> infinity} a(n)/10^n = A020862. - Alois P. Heinz, Jun 28 2021

CROSSREFS

See A000225, A020862, A034887.

STATUS

approved

editing

#25 by Alois P. Heinz at Mon Jun 28 11:53:50 EDT 2021

STATUS

editing

approved

#24 by Alois P. Heinz at Mon Jun 28 11:53:47 EDT 2021

LINKS

Alois P. Heinz, <a href="/A227689/b227689.txt">Table of n, a(n) for n = 0..1000</a>

STATUS

approved

editing

#23 by Alois P. Heinz at Mon Jun 28 08:40:06 EDT 2021

STATUS

reviewed

approved

#22 by Jon E. Schoenfield at Mon Jun 28 07:41:49 EDT 2021

STATUS

proposed

reviewed

#21 by Alois P. Heinz at Mon Jun 28 05:26:45 EDT 2021

STATUS

editing

proposed

#20 by Alois P. Heinz at Mon Jun 28 05:26:36 EDT 2021

EXTENSIONS

More terms a(7)-a(19) from Alois P. Heinz, Jun 28 2021

#19 by Alois P. Heinz at Mon Jun 28 05:24:56 EDT 2021

DATA

1, 30, 329, 3319, 33216, 332190, 3321925, 33219278, 332192807, 3321928092, 33219280946, 332192809486, 3321928094885, 33219280948871, 332192809488733, 3321928094887360, 33219280948873621, 332192809488736232, 3321928094887362345, 33219280948873623476

KEYWORD

nonn,base,more,changed

EXTENSIONS

More terms from Alois P. Heinz, Jun 28 2021

STATUS

reviewed

editing