OFFSET
0,1
COMMENTS
This is the 5-adic solution to x^2 = -9 that ends in 4. A327304 gives the other solution that ends in 1.
LINKS
Robert Israel, Table of n, a(n) for n = 0..10000
G. P. Michon, Introduction to p-adic integers, Numericana.
FORMULA
EXAMPLE
Equals ...1131142000414124220322114423220241100304.
MAPLE
op([1, 1, 3], select(t -> padic:-ratvaluep(t, 1)=4, [padic:-rootp(x^2+9, 5, 100)])); # Robert Israel, Aug 31 2020
PROG
(PARI) a(n) = truncate(-sqrt(-9+O(5^(n+1))))\5^n
CROSSREFS
Digits of 5-adic square roots:
A327304, this sequence (sqrt(-9));
KEYWORD
nonn,base
AUTHOR
Jianing Song, Sep 16 2019
STATUS
approved