A211679 Triangle of earliest friendly numbers having n friends.

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

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 A357462

Adjacent sequences: A211676 A211677 A211678 * A211680 A211681 A211682

Keyword

nonn,tabf,hard

Author

T. D. Noe, May 10 2012

Status

approved