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A325492
Digits of one of the four 5-adic integers 6^(1/4) that is congruent to 4 mod 5.
9
4, 0, 0, 3, 1, 3, 1, 1, 3, 4, 2, 2, 2, 2, 4, 1, 0, 1, 4, 0, 2, 3, 2, 2, 4, 3, 3, 2, 0, 2, 1, 0, 2, 3, 2, 1, 0, 1, 3, 4, 1, 2, 1, 0, 2, 1, 0, 0, 0, 2, 2, 2, 0, 3, 3, 4, 2, 3, 1, 1, 2, 4, 4, 3, 2, 0, 0, 3, 4, 0, 3, 4, 2, 0, 4, 2, 2, 4, 3, 1, 3, 3, 0, 1, 0, 3, 2, 2
OFFSET
0,1
COMMENTS
One of the two square roots of A324025, where an A-number represents a 5-adic number. The other square root is A325489.
For k not divisible by 5, k is a fourth power in 5-adic field if and only if k == 1 (mod 5). If k is a fourth power in 5-adic field, then k has exactly 4 fourth-power roots.
FORMULA
a(n) = (A325487(n+1) - A325487(n))/5^n.
For n > 0, a(n) = 4 - A325489(n).
EXAMPLE
The unique number k in [1, 5^3] and congruent to 4 modulo 5 such that k^4 - 6 is divisible by 5^3 is k = 4 = (4)_5, so the first three terms are 4, 0 and 0.
PROG
(PARI) a(n) = lift(-sqrtn(6+O(5^(n+1)), 4))\5^n
CROSSREFS
Digits of p-adic fourth-power roots:
A325489, A325490, A325491, this sequence (5-adic, 6^(1/4));
A324085, A324086, A324087, A324153 (13-adic, 3^(1/4)).
Sequence in context: A020808 A198364 A375221 * A266270 A091467 A224861
KEYWORD
nonn,base
AUTHOR
Jianing Song, Sep 07 2019
STATUS
approved