## Also 10^k+2^k+k

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• Has anyone studied primes of this form. Here are some: 10^a+a a = 1, 9, 69, 313, 451 10^b-b b = 3, 23, 171, 903 2^x+x x = 1, 3, 5, 9, 15, 39, 75, 81,
Message 1 of 1 , Jun 30, 2001
Has anyone studied primes of this form.
Here are some:

10^a+a a = 1, 9, 69, 313, 451

10^b-b b = 3, 23, 171, 903

2^x+x x = 1, 3, 5, 9, 15, 39, 75, 81, 89, 317, 791, 735, 1311, 1881, 3201, 3225

2^y-y y = 3, 9, 13, 19, 21, 55, 261

10^k+2^k+k k = 1, 11, 17, 85

Notice the prime "cousins" 2^3+3 and 2^3-3 and 2^9+9 and 2^9-9.
----- Original Message -----
From: Milton Brown
Cc: Milton Brown
Sent: Friday, June 29, 2001 9:24 AM
Subject: 10^a+a, 10^b-b, 2^x+x, and 2^y-y

Has anyone studied primes of this form.
Here are some:

10^a+a a = 1, 9, 69, 313, 451

10^b-b b = 3, 23, 171, 903

2^x+x x = 1, 3, 5, 9, 15, 39, 75, 81, 89, 317, 791, 735, 1311

2^y-y y = 3, 9, 13, 19, 21, 55, 261

Notice the prime "cousins" 2^3+3 and 2^3-3.

Milton L. Brown
miltbrown@...

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