STATUS
reviewed
approved
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Revision History for A018782
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Smallest k such that circle x^2 + y^2 = k passes through exactly 4n integer points.
(history; published version)
(history; published version)
STATUS
proposed
reviewed
STATUS
editing
proposed
EXAMPLE
4225 = 5^2 * 13^2 is the smallest number all of whose all prime factors are congruent to 1 modulo 4 with exactly 9 divisors, so a(9) = 4225. - Jianing Song, Apr 24 2021
STATUS
approved
editing
STATUS
reviewed
approved
STATUS
proposed
reviewed
STATUS
editing
proposed
EXAMPLE
4225 = 5^2 * 13^2 is the smallest number whose all prime factors are congruent to 1 modulo 4 with exactly 9 numbers, divisors, so a(9) = 4225. - Jianing Song, Apr 24 2021
STATUS
approved
editing
STATUS
proposed
approved
STATUS
editing
proposed