OFFSET

1,2

COMMENTS

This problem was discussed in a thread "Power of 2 with all even digits?" in the newsgroup sci.math (Jun 25 2004) with contributions from Edwin Clark, James Waldby, Bertram Felgenhauer, Richard Tobin, Oskar Lanzi III and others.

LINKS

Newsgroup sci.math, Power of 2 with all even digits?

EXAMPLE

a(5)=19 because 2^19=524288 is the smallest power of 2 that has a decimal representation ending in 5 even digits.

CROSSREFS

KEYWORD

base,nonn

AUTHOR

Hugo Pfoertner, Jul 07 2004

EXTENSIONS

a(21) - a(35) from Richard Tobin (richard(AT)cogsci.ed.ac.uk), Jun 29 2004

STATUS

approved