A179482 A subset of vampire numbers: n has a nontrivial factorization using n's digits in reverse order.

126, 153, 688, 1395, 33579, 37668, 187029, 223524, 267034, 1008126, 1480368, 1514955, 1574253, 1766196, 1791495, 1831086, 1945944, 2784384, 10013323, 10353244, 18937617, 19437888, 23486976, 36528975, 38477586, 45334998, 48471696, 109019911, 116257833

Offset: 1

Author

Adam Kertesz, Jul 16 2010

Keywords

• nonn
• base

Comments

A subset of A020342.

Easy to prove that no vampire number has a factorization with n's digits in "normal" (left-to-right) order, so it was natural to search if any of the reverse order works.

A superset of A009944,permitting two or more(!) factors. [Adam Kertesz, Aug 07 2010]

Sequence is infinite, since it is a superset of A009944 which is infinite (see Comments at A009944). - Giovanni Resta, Mar 17 2013

Examples

			E.g. 126=6*21, 1395=5*9*31, 267034=4307*62.
		

Links

• Giovanni Resta, Table of n, a(n) for n = 1..155
• Giovanni Resta, Decompositions of the first 155 terms

Crossrefs

Cf. A020342, A009944.

Extensions

a(10)-a(29) from Giovanni Resta, Mar 17 2013