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Revision History for A119177

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Showing entries 1-10 | older changes

A119177

Numbers k such that the k-th triangular number contains only digits {2,6,9}.
(history; published version)

#12 by Joerg Arndt at Fri Mar 31 02:49:24 EDT 2023

STATUS

reviewed

approved

#11 by Michel Marcus at Fri Mar 31 02:45:38 EDT 2023

STATUS

proposed

reviewed

#10 by Tyler Busby at Fri Mar 31 02:42:27 EDT 2023

STATUS

editing

proposed

#9 by Tyler Busby at Fri Mar 31 02:42:15 EDT 2023

DATA

3, 11, 36, 76, 7741188, 21305723, 4471447856, 24343059348, 6673334543723, 23094123478785548

COMMENTS

Next term exceeds 1.4*10^16.

LINKS

G. Giovanni Resta, <a href="http://www.numbersaplenty.com/tr/tr269.html">Tridigital Triangular Numbers</a>.

EXTENSIONS

a(10) from Tyler Busby, Mar 31 2023

STATUS

approved

editing

#8 by Joerg Arndt at Tue Jul 13 07:23:29 EDT 2021

STATUS

reviewed

approved

#7 by Felix Fröhlich at Tue Jul 13 07:16:23 EDT 2021

STATUS

proposed

reviewed

#6 by Jon E. Schoenfield at Tue Jul 13 06:26:20 EDT 2021

STATUS

editing

proposed

#5 by Jon E. Schoenfield at Tue Jul 13 06:26:18 EDT 2021

NAME

Numbers n k such that the nk-th triangular number contains only digits {2,6,9}.

COMMENTS

Next entry must be greater than term exceeds 1.4*10^16.

STATUS

approved

editing

#4 by Giovanni Resta at Thu Oct 08 04:58:35 EDT 2015

STATUS

editing

approved

#3 by Giovanni Resta at Thu Oct 08 04:58:31 EDT 2015

LINKS

G. Resta, <a href="http://www.iit.cnrnumbersaplenty.it/staffcom/giovanni.restatr/tritritr269.txthtml">Tridigital Triangular Numbers</a>

STATUS

approved

editing