A238857 - OEIS

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A238857

Array read by rows: row n lists total number of m-digit right-truncatable reversible primes in base n.

0, 1, 1, 1, 0, 2, 1, 1, 0, 2, 4, 4, 2, 0, 3, 1, 1, 0, 3, 5, 3, 1, 0, 4, 7, 7, 5, 1, 0, 4, 5, 5, 3, 0, 4, 5, 6, 1, 0, 4, 8, 7, 9, 4, 1, 0, 5, 5, 7, 5, 0, 5, 10, 8, 4, 1, 1, 0, 6, 11, 17, 12, 3, 1, 0, 6, 11, 13, 6, 2, 1, 0, 6, 9, 11, 9, 4, 1, 0, 6, 13, 12, 7, 1, 0, 7, 9, 7, 1, 0

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OFFSET

2,6

COMMENTS

For definitions and more comments, see A238854 and A238850.

This is an irregular table with one line for every base, starting at 2, while the columns correspond to the number of digits (1,2,3,...). Each row terminates with a zero (in any given base there appears to be a finite number of instances).

LINKS

Stanislav Sykora, Table of n, a(n) for n = 2..5071

Stanislav Sykora, PARI/GP scripts for genetic threads, with code and comments.

EXAMPLE

These are the first rows of the table:

2: 0,

3: 1, 1, 1, 0,

4: 2, 1, 1, 0,

5: 2, 4, 4, 2, 0,

6: 3, 1, 1, 0,

7: 3, 5, 3, 1, 0,

8: 4, 7, 7, 5, 1, 0,