A374805 a(n) is the smallest positive integer whose square can be represented as the sum of 3 distinct nonzero squares in exactly n ways, or -1 if no such number exists.

1, 7, 15, 23, 31, 21, 33, 39, 49, 45, 79, 57, 95, 103, 75, 69, 127, 87, 63, 151, 93, 167, 111, 123, 99, 187, 117, 105, 161, 241, 141, 135, 153, 247, 271, 283, 177, 183, 165, 275, 147, 171, 323, 219

Offset

0,2

Links

Table of n, a(n) for n=0..43.

Index entries for sequences related to sums of squares

Example

a(3) = 23: 23^2 = 3^2 + 6^2 + 22^2 = 3^2 + 14^2 + 18^2 = 6^2 + 13^2 + 18^2.

Crossrefs

Cf. A006339, A025415, A025442, A346071.

Sequence in context: A369375 A004215 A206906 * A295669 A179890 A292639

Adjacent sequences: A374802 A374803 A374804 * A374806 A374807 A374808

Keyword

nonn,more

Author

Ilya Gutkovskiy, Jul 20 2024

Extensions

a(35)-a(43) from Michael S. Branicky, Jul 21 2024

Status

approved