OFFSET

1,1

COMMENTS

Numbers n for which two plus the number of the trailing zeros in their factorial base representation A007623(n) is a composite number larger than 5.

All terms are multiples of 120. Specifically, these are all those terms of A232742 which are divisible by 120 (or equally: 24).

Please see also the comments in A055926, whose subset this sequence is.

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..25920

EXAMPLE

120 is included because A055881(120)=5 and 5+1 is a composite number larger than 5. Note that A007623(120) = '10000', with four trailing zeros.

PROG

(Scheme, with Antti Karttunen's IntSeq-library)

CROSSREFS

KEYWORD

nonn

AUTHOR

Antti Karttunen, Dec 01 2013

STATUS

approved