1,1

Numbers having 3 prime factors (with multiplicity) and which are not the sum of the aliquot parts of any number. 3-almost prime analogue of A119379 Untouchable semiprimes: semiprimes which are not the sum of the aliquot parts of any number. 2 and 5 are almost surely the only untouchable primes.

A005114 intersect A014612.

Cf. A005114, A014612, A119379.

Sequence in context: A044522 A044239 A044620 this_sequence A122166 A044303 A044684

Adjacent sequences: A120531 A120532 A120533 this_sequence A120535 A120536 A120537

nonn

Jonathan Vos Post (jvospost3(AT)gmail.com), Aug 06 2006