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A325083 Prime numbers congruent to 1, 65 or 81 modulo 112 representable by both x^2 + 14*y^2 and x^2 + 448*y^2. 3
449, 673, 977, 1409, 1873, 2017, 2081, 2129, 2417, 2657, 2753, 3313, 3697, 4001, 4561, 4657, 4673, 4817, 4993, 6689, 6833, 7057, 7121, 7393, 7457, 7793, 8017, 8353, 8369, 8689, 8849, 9377, 9473, 9857, 10193, 10273, 11057, 11393, 11489, 11953, 12161, 12289 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Brink showed that prime numbers congruent to 1, 65 or 81 modulo 112 are representable by both or neither of the quadratic forms x^2 + 14*y^2 and x^2 + 448*y^2. This sequence corresponds to those representable by both, and A325084 corresponds to those representable by neither.

LINKS

Table of n, a(n) for n=1..42.

David Brink, Five peculiar theorems on simultaneous representation of primes by quadratic forms, Journal of Number Theory 129(2) (2009), 464-468, doi:10.1016/j.jnt.2008.04.007, MR 2473893.

Rémy Sigrist, PARI program for A325083

Wikipedia, Kaplansky's theorem on quadratic forms

EXAMPLE

Regarding 3313:

- 3313 is a prime number,

- 3313 = 29*112 + 65,

- 3313 = 53^2 + 14*6^2 = 39^2 + 448*2^2,

- hence 3313 belongs to this sequence.

PROG

(PARI) See Links section.

CROSSREFS

See A325067 for similar results.

Cf. A325084.

Sequence in context: A319060 A339532 A105376 * A243402 A135073 A160291

Adjacent sequences:  A325080 A325081 A325082 * A325084 A325085 A325086

KEYWORD

nonn

AUTHOR

Rémy Sigrist, Mar 28 2019

STATUS

approved

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Last modified November 28 05:30 EST 2021. Contains 349401 sequences. (Running on oeis4.)