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A115748 Numbers n such that sigma(n)=7*reversal(n). 1
63301, 651001, 6967932, 2158803990, 88858402692 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(6) > 10^12. - Giovanni Resta, Oct 28 2012

LINKS

Table of n, a(n) for n=1..5.

EXAMPLE

2158803990 is in the sequence because sigma(2158803990)

=6951619584=7*993088512=7*reversal(2158803990).

CROSSREFS

Cf. A069216, A105324, A114928.

Sequence in context: A209713 A230681 A209793 * A226003 A203921 A237918

Adjacent sequences:  A115745 A115746 A115747 * A115749 A115750 A115751

KEYWORD

base,more,nonn

AUTHOR

Farideh Firoozbakht, Feb 12 2006

EXTENSIONS

a(5) from Donovan Johnson, Dec 21 2008

STATUS

approved

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Last modified July 4 22:27 EDT 2022. Contains 355086 sequences. (Running on oeis4.)