primes of the form 2^n+5

Larry Reeves Larry.Reeves at
Fri Oct 4 15:45:08 CEST 2002

Already in the database as sequence A059242 (although you have added 3 more terms).

larryr at

-----Original Message-----
From: Santi Spadaro [mailto:santi_spadaro at]
Sent: Friday, October 04, 2002 8:07 AM
To: seqfan at
Subject: primes of the form 2^n+5

These are the values of n such that 2^n+5 is prime (up to 3000):

1, 3, 5, 11, 47, 53, 141, 143, 191, 273, 341

I've just submitted it to the OEIS.
They are very sparse. Someone can extend this sequence?


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