A369768 Numbers X such that X^2 + Y^2 = 3^(2*k) + 1 and X > Y > 0 and k is the ternary digit length of X-1.
3, 9, 21, 27, 71, 81, 195, 233, 243, 711, 729, 1583, 1749, 2157, 2187, 6561, 14829, 15747, 19629, 19683, 57609, 59049, 141717, 154727, 175537, 177147, 385559, 394471, 414649, 422729, 446489, 462601, 468919, 482759, 488431, 504161, 515649, 524559, 529599, 530529
Offset: 1
Links
- A.H.M. Smeets, Table of n, a(n) for n = 1..191
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