138

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Number

$138$ (one hundred and thirty-eight) is:

$2 \times 3 \times 23$

The $11$th sphenic number after $30$, $42$, $66$, $70$, $78$, $102$, $105$, $110$, $114$, $130$:

$138 = 2 \times 3 \times 23$

Its aliquot sequence terminates in $1$ after $177$ steps.

Also see

• Aliquot Sequence starting from $138$

• Previous  ... Next: Sphenic Number

Sources

• 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $276$
• 1994: Richard K. Guy: Unsolved Problems in Number Theory (2nd ed.)
• 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $276$