User talk:Jens Kruse Andersen

New question:

Do you know of any general formula that can be used to find numbers that -k is never a square mod?? The sequence starts:

• k=1: All primes 1 less than a multiple of 4 (as well as composite number 4)
• k=2: All primes 1 or 3 less than a multiple of 8
• k=3: All primes 1 less than a multiple of 6
• k=4: All primes 1 less than a multiple of 4
• k=5: All primes 1, 3, 7, or 9 less than a multiple of 20.
• k=6: Do you know??

J. Lowell 14:25, 9 August 2014 (UTC)