A387984 Carmichael numbers that can be written as a product of three Carmichael numbers.

2094319836529921, 60524817082337881, 131757951601710721, 141125066711098561, 227818277350370785, 924240561494041441, 1241369937061491601, 1577784323926047601, 2073320996869599841, 2934904598948432881, 3015588206205772561, 3374367062537908801

Offset

1,1

Comments

a(1135) = 521649490603448721200401 = 75361 * 252601 * 488881 * 56052361 is also the smallest Carmichael number that is the product of four Carmichael numbers (and the only one below 10^24).

Links

Benne de Weger, Table of n, a(n) for n = 1..1396

Benne de Weger, Carmichael numbers that are products of Carmichael numbers

Example

a(1) = 2094319836529921 = 46657 * 52633 * 852841,
a(156) = 2579080898614287173401 = 488881 * 1193221 * 4421207701 = 488881 * 31405501 * 167979421 has two different representations.

Crossrefs

Cf. A002997, A207041.

Sequence in context: A216910 A309111 A047698 * A246252 A058445 A290540

Adjacent sequences: A387981 A387982 A387983 * A387985 A387986 A387987

Keyword

nonn

Author

Benne de Weger, Oct 13 2025

Status

approved