OFFSET
0,4
LINKS
David A. Corneth, Table of n, a(n) for n = 0..998
FORMULA
EXAMPLE
For n=2 there is only one digit '6' in the sequence 0, 1, 2, ..., 12.
For n=3 there are 11 + 10 = 21 more digits '6' in { 16, 26, ..., 56, 60, ..., 69, 76, 86, ..., 116 }, where 66 accounts for two '6's.
MATHEMATICA
T[int_Integer, {bndsLow_Integer, bndsUpp_Integer}] := Table[
Count[
Flatten[Table[
IntegerDigits[m],
{m, 1, Sum[
10^i - 1,
{i, n}
]/9
}
]],
int
],
{n, bndsLow, bndsUpp}
];
T[6, {0, 7}](* Robert P. P. McKone, Jan 01 2021 *)
PROG
(PARI) print1(c=N=0); for(n=1, 8, print1(", "c+=sum(k=N+1, N=N*10+n, #select(d->d==6, digits(k)))))
(PARI) A277836(n, m=6)=if(n>m, A277836(n, m+1)+(m+2)*10^(n-m-1), A277830(n)-(m>n)) \\ M. F. Hasler, Nov 02 2016
CROSSREFS
KEYWORD
nonn,base
AUTHOR
M. F. Hasler, Nov 01 2016
EXTENSIONS
More terms from Lars Blomberg, Nov 05 2016
Removed incorrect b-file. - David A. Corneth, Dec 31 2020
STATUS
approved