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Forty-nine is the natural number following 48 and preceding 50.

${\displaystyle 49=7^{2}}$

It is a Somer pseudoprime based on 8.

Forty-nine is also:

• The atomic number of indium.
• The span between Jubilee years as ordained in the Holy Bible.
• The number of strings on a harp and the number of keys on a celesta.
• The code for international direct dial phone calls to Germany.
• As in 49er, the moniker of those who participated in the 1849 gold rush.
• The years 49 BC, 49 AD, or 1949.