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

1,1

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

Links

Giovanni Resta, Table of n, a(n) for n = 1..155

Giovanni Resta, Decompositions of the first 155 terms

Example

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

Crossrefs

Cf. A020342, A009944.

Sequence in context: A025389 A025380 A020342 * A009944 A203566 A320292

Adjacent sequences: A179479 A179480 A179481 * A179483 A179484 A179485

Keyword

nonn,base

Author

Adam Kertesz, Jul 16 2010

Extensions

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

Status

approved