A326051 1/2 times 3-perfect (triply perfect, tri-perfect, triperfect or sous-double) numbers: a(n) = A005820(n)/2.

60, 336, 261888, 229909120, 738152448, 25500590080

Offset

1,1

Comments

If any odd perfect numbers exist, they should occur in this sequence, unless it is already complete, as some people believe. Please see comments and links in A005820.

Links

Table of n, a(n) for n=1..6.

Index entries for sequences where any odd perfect numbers must occur

Formula

a(n) = A005820(n)/2.

Crossrefs

Cf. A005820.

Sequence in context: A092478 A228889 A262385 * A024184 A293615 A119631

Adjacent sequences: A326048 A326049 A326050 * A326052 A326053 A326054

Keyword

nonn,more,hard

Author

Antti Karttunen, Jun 12 2019

Status

approved