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A211679 Triangle of earliest friendly numbers having n friends. 3
6, 28, 6, 28, 496, 84, 270, 1488, 1638, 84, 270, 1488, 1638, 24384, 210, 17360, 43400, 284480, 2229500, 2886100, 3780, 66960, 167400, 406224, 1097280, 6656832, 13035330, 3780, 66960, 167400, 406224, 1097280, 6656832, 13035330, 29410290 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

COMMENTS

Row n contains the earliest set of friendly numbers of length n. The sequence A211677 contains the last element of each row.

LINKS

Donovan Johnson, Table of n, a(n) for n = 2..45

CROSSREFS

Cf. A074902 (friendly numbers), A211677.

Sequence in context: A101454 A091911 A215896 * A261868 A342922 A105402

Adjacent sequences:  A211676 A211677 A211678 * A211680 A211681 A211682

KEYWORD

nonn,tabf,hard

AUTHOR

T. D. Noe, May 10 2012

STATUS

approved

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Last modified November 30 15:30 EST 2021. Contains 349420 sequences. (Running on oeis4.)