A365505 a(n) is the least integer that can be expressed as the sum of a prime number and the n-th power of a positive integer in exactly n ways, or -1 if no such integer exists.

3, 6, 128, 1298, 375534

Offset

1,1

Links

Table of n, a(n) for n=1..5.

Example

For n = 3: 128 = 3 + 5^3 = 101 + 3^3 = 127 + 1^3.

Crossrefs

Cf. A064283, A365290, A365292, A365504.

Sequence in context: A225884 A115647 A019437 * A291982 A309258 A163423

Adjacent sequences: A365502 A365503 A365504 * A365506 A365507 A365508

Keyword

nonn,more

Author

Ilya Gutkovskiy, Sep 07 2023

Status

approved