A120534 Untouchable 3-almost primes.

52, 124, 188, 238, 246, 268, 290, 292, 322, 406, 426, 430, 474, 498, 518, 530, 556, 628, 658, 668, 670, 782, 892, 894, 902, 964, 1002, 1028, 1074, 1102, 1146, 1162, 1222, 1246, 1258, 1266, 1342, 1348, 1388, 1398, 1406, 1506, 1510, 1542, 1578, 1588, 1682, 1732, 1758, 1842, 1844, 1852

Offset

1,1

Comments

Numbers having 3 prime factors (with multiplicity) and which are not the sum of the aliquot parts of any number.

2 and 5 are almost surely the only untouchable primes.

Links

Amiram Eldar, Table of n, a(n) for n = 1..10000 (terms 1..1000 from Giovanni Resta)

Crossrefs

Intersection of A005114 and A014612.

Cf. A119379.

Sequence in context: A326912 A327147 A346898 * A122166 A205221 A044303

Adjacent sequences: A120531 A120532 A120533 * A120535 A120536 A120537

Keyword

nonn

Author

Jonathan Vos Post, Aug 06 2006

Status

approved