Mind Exercise: Number Sequence13

Mental exercise sharpens memory and delays the onset of age related mental disorders. Mind gymnastics are also fun and make great conversation starters.

Sharpen your mind and exercise your brain with this number series mind puzzle. Mind and mental exercises such as this mind teaser help to keep your brain young.

For more mind related articles see Mind & Attitude in the index.

Exercise:

Replace the ? with the correct answer in this number sequence:

1, 3, 5,15, 17, ?

Source: Unknown

Solution Here