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Revision History for A216996

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

A216996

Numbers n such that the digit sum of n*7 is a multiple of 7.
(history; published version)

#16 by Susanna Cuyler at Thu Mar 08 21:14:12 EST 2018

STATUS

proposed

approved

#15 by Robert Israel at Thu Mar 08 19:22:37 EST 2018

STATUS

editing

proposed

#14 by Robert Israel at Thu Mar 08 19:22:15 EST 2018

COMMENTS

If n is in the sequence, so are 10*n and 10*n+1. - Robert Israel, Mar 08 2018

#13 by Robert Israel at Thu Mar 08 19:20:41 EST 2018

LINKS

Robert Israel, <a href="/A216996/b216996.txt">Table of n, a(n) for n = 1..10000</a>

#12 by Robert Israel at Thu Mar 08 19:19:33 EST 2018

MAPLE

filter:= n -> convert(convert(7*n, base, 10), `+`) mod 7 = 0:

select(filter, [$1..1000]); # Robert Israel, Mar 08 2018

STATUS

approved

editing

#11 by T. D. Noe at Mon Sep 24 13:19:25 EDT 2012

STATUS

editing

approved

#10 by T. D. Noe at Mon Sep 24 13:19:20 EDT 2012

CROSSREFS

Cf. A216994, A216995, A216997, A216998 and , A217009.

STATUS

approved

editing

#9 by T. D. Noe at Mon Sep 24 13:15:08 EDT 2012

STATUS

proposed

approved

#8 by Jon Perry at Mon Sep 24 12:51:23 EDT 2012

STATUS

editing

proposed

#7 by Jon Perry at Mon Sep 24 12:51:11 EDT 2012

CROSSREFS

Cf. A216994, A216995, A216997, A216998 and A217009.

STATUS

proposed

editing