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A293693 Numbers z such that x^2 + y^7 = z^2 (with positive integers x and y) and gcd(x, y, z) = 1. 2
33, 1094, 2219, 4097, 6283, 39063, 40156, 69985, 78157, 82221, 148109, 411772, 412865, 450834, 524289, 526475, 602413, 823575, 827639, 893527, 1347831, 2391485, 2430547, 2500001, 2502187, 2803256, 3323543, 4783001, 4787065, 5307257, 7282969, 8957953, 9036077 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Subsequence of A293692.

LINKS

Chai Wah Wu, Table of n, a(n) for n = 1..10000

EXAMPLE

31^2 + 2^7 = 33^2 and gcd(31, 2, 33) = 1, 33 is a term.

8879827^2 + 60^7 = 9036077^2 and gcd(8879827, 60, 9036077) = 1, 9036077 is a term.

MATHEMATICA

z={}; Do[If[IntegerQ[(n^2 - y^7)^(1/2)] && GCD[y, n]==1, AppendTo[z, n]], {n, 9.7*10^6}, {y, (n^2 - 1)^(1/7)}]; z

CROSSREFS

Cf. A103156, A174115, A293284, A293692.

Sequence in context: A188989 A189199 A009977 * A187539 A130835 A262101

Adjacent sequences:  A293690 A293691 A293692 * A293694 A293695 A293696

KEYWORD

nonn

AUTHOR

XU Pingya, Oct 14 2017

STATUS

approved

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Last modified November 11 22:31 EST 2019. Contains 329046 sequences. (Running on oeis4.)