The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A364855

(Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A364855

Initial digit of 3^(3^n) (A055777(n)).
(history; published version)

#20 by Michael De Vlieger at Sat Aug 12 09:45:18 EDT 2023

STATUS

reviewed

approved

#19 by Kevin Ryde at Sat Aug 12 04:58:11 EDT 2023

STATUS

proposed

reviewed

#18 by Jinyuan Wang at Fri Aug 11 21:46:39 EDT 2023

STATUS

editing

proposed

#17 by Jinyuan Wang at Fri Aug 11 21:46:30 EDT 2023

NAME

Initial digit of 3^(3^n) (A055777(n)).

STATUS

proposed

editing

#16 by Jinyuan Wang at Fri Aug 11 21:44:26 EDT 2023

STATUS

editing

proposed

#15 by Jinyuan Wang at Fri Aug 11 21:42:45 EDT 2023

DATA

3, 2, 1, 7, 4, 8, 6, 2, 2, 1, 3, 3, 6, 2, 1, 3, 3, 4, 6, 2, 2, 1, 1, 1, 5, 1, 2, 1, 1, 7, 4, 1, 1, 4, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 2, 1, 1, 2, 2, 1, 1, 1, 7, 4, 8, 6, 2, 1, 2, 1, 3, 4, 1, 1, 1, 4, 8, 6, 2, 2, 1, 2, 2, 1, 5, 1, 6, 3, 3, 4, 1, 1, 2, 1, 5, 1, 4, 1

KEYWORD

nonn,base,more,changed

EXTENSIONS

More terms from Jinyuan Wang, Aug 11 2023

STATUS

proposed

editing

#14 by Kevin Ryde at Fri Aug 11 21:23:29 EDT 2023

STATUS

editing

proposed

#13 by Kevin Ryde at Fri Aug 11 21:18:00 EDT 2023

KEYWORD

nonn,base,hard,more,changed

Discussion

Fri Aug 11

21:23

Kevin Ryde: Not keyword hard as some interval arithmetic can hold just a few high digits and cube them n times (for at least medium size n in reach of the computer).

#12 by Kevin Ryde at Fri Aug 11 21:16:28 EDT 2023

COMMENTS

The final digit of 3^(3^n) is equal to 7 if and only if n is odd, whereas it is equal to 3 otherwise (n even, see A010705).

The corresponding final digit of 3^(3^n) is A010705(n) = 3 if n even or 7 if n odd.

STATUS

proposed

editing

#11 by Michel Marcus at Fri Aug 11 11:43:07 EDT 2023

STATUS

editing

proposed