A374270 - OEIS

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A374270

a(n) is the smallest number which can be represented as the sum of n distinct n-th powers of primes in exactly 2 ways, or -1 if no such number exists.

2

-1, 410, 185527, 6539044, 2250298051, 1397942436813, 56190747296833091

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OFFSET

1,2

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

a(2) = 410 = 7^2 + 19^2 = 11^2 + 17^2.

a(3) = 185527 = 13^3 + 43^3 + 47^3 = 19^3 + 31^3 + 53^3.

CROSSREFS

Cf. A349764, A374256, A374271, A374272.

Sequence in context: A179129 A176598 A146075 * A212710 A187991 A090123

Adjacent sequences: A374267 A374268 A374269 * A374271 A374272 A374273

KEYWORD

sign,more

AUTHOR

Ilya Gutkovskiy, Jul 02 2024

EXTENSIONS

a(7) from Michael S. Branicky, Jul 09 2024

STATUS

approved