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Who knows one hundred sixty-one?

Please cite/link your sources, if possible. At some point at least twenty-four hours from now, I will:

  • Upvote all interesting answers.

  • Accept the best answer.

  • Go on to the next number.

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up vote 5 down vote accepted

On average it takes 161 Jewish months to become Bar Mitzva. 13 x 12 = 156 + 5 extra Adars.

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That'd be, I suppose, both the mode and the ceiling of the average (mean), but obviously not the exact average (up arrow from me anyway :-) ). – msh210 Jan 7 '11 at 5:23
@msh210 We deal in integers around here. This isn't the first time someone's shoehorned an answer into this series using floor or ceiling. How many days, for example, are in a month? – Isaac Moses Jan 7 '11 at 19:43
@Gershon, nice find! – Isaac Moses Jan 7 '11 at 19:43
@R'IM, I wasn't disputing or even frowning upon the answer (it was a nice find), but merely pointing out the math in case someone didn't realize. – msh210 Jan 7 '11 at 19:59

R'u was 161 was Avraham was born. (Source: Rashi to B'reshis 19:20.)

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