The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A067478 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A067478

Smallest n-digit square starting with 8.
(history; published version)

#19 by N. J. A. Sloane at Mon Mar 22 02:42:40 EDT 2021

STATUS

proposed

approved

#18 by Michel Marcus at Mon Mar 22 02:06:01 EDT 2021

STATUS

editing

proposed

#17 by Michel Marcus at Mon Mar 22 02:05:53 EDT 2021

CROSSREFS

Cf. A000290, A035075 (roots), A045791, A067479 (2..9).

STATUS

proposed

editing

#16 by Alois P. Heinz at Sun Mar 21 21:53:31 EDT 2021

STATUS

editing

proposed

Discussion

Sun Mar 21

23:16

Jon E. Schoenfield: Oops!  I missed that!  I'm sorry.  Thanks for correcting it!

#15 by Alois P. Heinz at Sun Mar 21 21:51:36 EDT 2021

DATA

81, 841, 8100, 80089, 801025, 8003241, 80013025, 800041225, 8000050249, 80000162649, 800001447184, 8000004951184, 80000001609984, 800000042569984, 8000000160998400, 80000000297200369, 800000000000150481, 8000000001435765625, 80000000000015048100

FORMULA

a(n) = ceiling(sqrt(8*10^(n-1)))^2. - Sascha Kurz, Mar 18 2002

KEYWORD

nonn,base,easy,nonn,changed

STATUS

proposed

editing

Discussion

Sun Mar 21

21:52

Alois P. Heinz: ... formula adapted to offset ...

#14 by Sean A. Irvine at Sun Mar 21 16:36:27 EDT 2021

STATUS

editing

proposed

Discussion

Sun Mar 21

16:37

Sean A. Irvine: Note to other editors, a(1)=9 does not start with 8 and also does not match offset of 2.

16:47

Jon E. Schoenfield: Thanks!

#13 by Sean A. Irvine at Sun Mar 21 16:36:00 EDT 2021

EXTENSIONS

Incorrect a(1) removed by Jon E. Schoenfield, Mar 21 2021

STATUS

proposed

editing

Discussion

Sun Mar 21

16:36

Sean A. Irvine: I think so.

#12 by Jon E. Schoenfield at Sun Mar 21 16:28:48 EDT 2021

STATUS

editing

proposed

#11 by Jon E. Schoenfield at Sun Mar 21 16:27:52 EDT 2021

DATA

9, 81, 841, 8100, 80089, 801025, 8003241, 80013025, 800041225, 8000050249, 80000162649, 800001447184, 8000004951184, 80000001609984, 800000042569984, 8000000160998400, 80000000297200369, 800000000000150481

FORMULA

a(n) = ceiling(sqrt(8*10^n)))^2. - Sascha Kurz, Mar 18 2002

STATUS

approved

editing

Discussion

Sun Mar 21

16:28

Jon E. Schoenfield: Should I add an Extensions entry like "Incorrect a(1) term deleted by ~~~~" or something else?

#10 by Jon E. Schoenfield at Mon Aug 14 22:41:36 EDT 2017

STATUS

editing

approved