OFFSET
0,1
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..10000
FORMULA
Define the sequence {b(n)} by the recurrence b(0) = 0 and b(1) = 7, b(n) = b(n-1) + 3 * (9 * b(n-1)^3 + 43) mod 10^n for n > 1, then a(n) = (b(n+1) - b(n))/10^n.
EXAMPLE
7^3 == 3 (mod 10).
97^3 == 73 (mod 10^2).
397^3 == 773 (mod 10^3).
1397^3 == 7773 (mod 10^4).
41397^3 == 77773 (mod 10^5).
941397^3 == 777773 (mod 10^6).
PROG
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Seiichi Manyama, Aug 11 2019
STATUS
approved