# 11011...00111 (1601-digits)

This number is a prime.

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Let z(s) be the number 11011100101 ... , concenating the
binary representation of the numbers 1 to s. So,
z(4)=11011100. Now, the number above is z(231), the
smallest prime of this form. It has 1601 digits, which is
also a prime. Moreover, 231 has a palindromic binary
representation. [Wallrodt]
Submitted: 2010-11-16 22:49:27; Last Modified: 2020-06-13 13:23:36.

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