A244032 - OEIS

A244032

Positive numbers n such that there exists a positive number m != n such that x^2+ny^2 and x^2+my^2 represent the same odd primes.

1, 4, 8, 9, 12, 16, 24, 45, 48, 72, 80, 120, 240

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

There are no other terms for which both n and m are < 100000.

LINKS

N. J. A. Sloane et al., Binary Quadratic Forms and OEIS (Index to related sequences, programs, references)

EXAMPLE

For example, 9 and 12 are members because the odd primes (in fact all the primes) represented by x^2+9y^2 and x^2+12y^2 are the same - see A068228.

CROSSREFS

KEYWORD

nonn

AUTHOR

STATUS

approved