A388289 - OEIS

A388289

One half of the even Markoff numbers.

1, 17, 97, 305, 3233, 5473, 18833, 31105, 98209, 323009, 639409, 1006337, 1762289, 3726689, 5742577, 10015585, 10765889, 31622993, 102636481, 126595633, 187990673, 323536049, 567451585, 737853073, 1075619873, 3224987137, 3342169921, 10182505537, 12396671585, 25065271937

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OFFSET

1,2

LINKS

Table of n, a(n) for n=1..30.

FORMULA

a(n) = A002559(A388290(n))/2, for n >= 1.

a(n) = 1 + 16*A309376(A388290(n)), for n >= 1.

EXAMPLE

a(1) = 1 = A002559(2)/2 = 1 + 16*0.

a(2) = 17 = A002559(6)/2 = 1 + 16*1.

a(4) = 305 = A002559(12)/2 = 1 + 16*19 = 305 = 5*61.