A371812 Number of different ways A329383(n) is Brazilian.

0, 1, 2, 3, 4, 5, 7, 8, 9, 11, 14, 15, 16, 17, 19, 23, 29, 31, 35, 39, 41, 44, 47, 49, 52, 59, 63, 71, 79, 83, 89, 95, 99, 107, 111, 119, 127, 143, 159, 167, 179, 190, 191, 199, 215, 223, 239, 251, 255, 287, 299, 319, 335, 359, 383, 399, 431, 447, 479, 503

Offset: 1

Author

Daniel Mondot, Apr 06 2024

Keywords

• nonn
• base

Comments

Or number of bases from 2 to n-2 in which the highly Brazilian number A329383(n) is a repdigit number.

Note that from a(26) to a(75) except for a(31) and a(42), a(n) = 4k-1 for some k.

Examples

			A329383(2) = 7 is Brazilian in only 1 base below 6 (base 2), so a(2) = 1.
A329383(3) = 15 is Brazilian in 2 bases below 14 (bases 2, 4), so a(3) = 2.
		

Links

• Daniel Mondot, Table of n, a(n) for n = 1..91

Crossrefs

Cf. A329383, A284758, A242397.

Programs

C

#include 
FILE *fi;
unsigned int cnt, d, line;
long unsigned base, k, ln;
void main()
{
    fi = fopen("b329383.txt", "r");
    for(;;)
    {
        if (fscanf(fi, "%u %lu", &line, &ln) < 2) break;
        for (cnt=0, base=2; base