A082577 a(n) = first digit to the right of decimal point of n*(sqrt(5)-1)/2.

6, 2, 8, 4, 0, 7, 3, 9, 5, 1, 7, 4, 0, 6, 2, 8, 5, 1, 7, 3, 9, 5, 2, 8, 4, 0, 6, 3, 9, 5, 1, 7, 3, 0, 6, 2, 8, 4, 1, 7, 3, 9, 5, 1, 8, 4, 0, 6, 2, 9, 5, 1, 7, 3, 9

Offset

1,1

References

J. Kappraff, Beyond Measure, World Scientific, 2002, p. 537.

Links

Table of n, a(n) for n=1..55.

Formula

n*0.618033989..., discard integer, then extract first digit to right of decimal.

Example

12th term is 4 since (12)(.618033989...) = 7.4164...

Prog

(PARI) a(n)=(sqrtint(125*n^2)-n%2*5)%10 \\ Charles R Greathouse IV, Feb 11 2024

Crossrefs

Sequence in context: A019692 A031259 A059629 * A098686 A079718 A062771

Adjacent sequences: A082574 A082575 A082576 * A082578 A082579 A082580

Keyword

nonn,base,easy

Author

Gary W. Adamson, May 07 2003

Status

approved