A242827 Primes formed by the initial digits of the decimal expansion of 1/14, starting at the first nonzero digit in the expansion.

7, 71, 71428571, 7142857142857, 7142857142857142857142857142857

Offset: 1

Author

Felix Fröhlich, May 23 2014

Keywords

• nonn
• base

Comments

a(6) has 104 digits. - Michel Marcus, May 26 2014

Crossrefs

Cf. A021018.

Corresponding sequences for 1/k: A242824 (k=7), A093676 (k=12), A242826 (k=13), A242828 (k=17), A242833 (k=19).

Programs

PARI

lista(nn) = {v = [7,1,4,2,8,5]; n = 0; for (i=0, nn, n = 10*n+ v[(i % 6)+1]; if (ispseudoprime(n), print1(n, ", ")););} \\ Michel Marcus, May 26 2014