Template:Sequence of the Day for January 8

Intended for: January 8, 2012

Timetable

• First draft entered by Alonso del Arte on October 29, 2011 ✓
• Draft reviewed by Daniel Forgues on November 6, 2011 ✓
• Draft to be approved by December 8, 2011

Yesterday's SOTD * Tomorrow's SOTD

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A185086: Fouvry–Iwaniec primes: primes of the form

k  2 + p  2

where

p

is a prime.

{ 5, 13, 29, 41, 53, 61, 73, ... }

These numbers are prime in

ℤ

but composite in

ℤ[i ]

. In the latter, they are the product of

k + p i

and

k  −  p i

. (See Gaussian integers.)