Quartan prime

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In mathematics, a quartan prime is a prime number of the form x4 + y4, where x > 0, y > 0 (and x and y are integers). The odd quartan primes are of the form 16n + 1.

For example, 17 is the smallest odd quartan prime: 14 + 24 = 1 + 16 = 17.

With the exception of 2 (x = y = 1), one of x and y will be odd, and the other will be even. If both are odd or even, the resulting integer will be even, and 2 is the only even prime.

The first few quartan primes are

2, 17, 97, 257, 337, 641, 881, … (sequence A002645 in the OEIS).

See also[edit]

References[edit]

  • Neil Sloane, A Handbook of Integer Sequences, Academic Press, NY, 1973.