OFFSET
0,1
LINKS
Robert Israel, Table of n, a(n) for n = 0..10000
MAPLE
op([1, 3], padic:-rootp(x^5-2, 7, 101)); # Robert Israel, Aug 04 2019
PROG
(Ruby)
require 'OpenSSL'
def f_a(ary, a)
(0..ary.size - 1).inject(0){|s, i| s + ary[i] * a ** i}
end
def df(ary)
(1..ary.size - 1).map{|i| i * ary[i]}
end
def A(c_ary, k, m, n)
x = OpenSSL::BN.new((-f_a(df(c_ary), k)).to_s).mod_inverse(m).to_i % m
f_ary = c_ary.map{|i| x * i}
f_ary[1] += 1
d_ary = []
ary = [0]
a, mod = k, m
(n + 1).times{|i|
b = a % mod
d_ary << (b - ary[-1]) / m ** i
ary << b
a = f_a(f_ary, b)
mod *= m
}
d_ary
end
def A309445(n)
A([-2, 0, 0, 0, 0, 1], 4, 7, n)
end
p A309445(100)
(PARI) Vecrev(digits(truncate((2+O(7^100))^(1/5)), 7))
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Seiichi Manyama, Aug 03 2019
STATUS
approved