A235249 Fixed point when A001175 (Pisano periods) is iterated with starting value n.

1, 24, 24, 24, 120, 24, 24, 24, 24, 120, 120, 24, 24, 24, 120, 24, 24, 24, 24, 120, 24, 120, 24, 24, 600, 24, 24, 24, 24, 120, 120, 24, 120, 24, 120, 24, 24, 24, 24, 120, 120, 24, 120, 120, 120, 24, 24, 24, 24, 600, 24, 24, 24, 24, 120, 24, 24, 24, 24, 120

Offset: 1

Author

Reinhard Zumkeller, Jan 15 2014

Keywords

• nonn

Comments

Are the powers of 5 (together with 2) the indices of records in this sequence? - Charles R Greathouse IV, Aug 11 2022

Links

• Reinhard Zumkeller, Table of n, a(n) for n = 1..10000
• J. D. Fulton and W. L. Morris, On arithmetical functions related to the Fibonacci numbers, Acta Arithmetica, 16 (1969), 105-110.
• Wikipedia, Pisano period

Crossrefs

Cf. A001175, A001179.

Programs

Haskell

a235249 n = if y == n then n else a235249 y  where y = a001175 n

Formula

a(n) = 24*5^(A001179(n)-1) for n > 1.

A001175(a(n)) = a(n).