A369769 - OEIS

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A369769

Numbers X such that X^2 + Y^2 = 5^(2*k) + 1 and X > Y > 0 and k is the quintal digit length of X-1.

2

5, 25, 115, 125, 551, 625, 2551, 2885, 3049, 3125, 15575, 15625, 72115, 78125, 303551, 390625, 1461799, 1790635, 1802885, 1847551, 1857449, 1946801, 1952875, 1953125, 8053505, 8468945, 9734425, 9765625, 36631645, 43890449, 45072115, 48828125, 215049449, 215418199

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

The number of terms for a given k is A025435(5^(2*k)+1).

LINKS

A.H.M. Smeets, Table of n, a(n) for n = 1..116

CROSSREFS

Cf. A369703 (base 2), A369768 (base 3), this sequence (base 5), A368418 (base 10).

Sequence in context: A092440 A196985 A124534 * A261383 A089947 A267467

Adjacent sequences: A369766 A369767 A369768 * A369770 A369771 A369772

KEYWORD

nonn,base

AUTHOR

A.H.M. Smeets, Jan 31 2024

STATUS

approved