A242833 Primes formed by the initial digits of the decimal expansion of 1/19, starting at the first nonzero digit in the expansion.

5, 52631, 5263157894736842105263157, 52631578947368421052631578947368421052631578947368421052631

Offset

1,1

Comments

a(5) has 95 digits and a(6) has 907 digits. - Michel Marcus, May 27 2014

Links

Jon E. Schoenfield, Table of n, a(n) for n = 1..6

Prog

(PARI) lista(nn) = {v = [5, 2, 6, 3, 1, 5, 7, 8, 9, 4, 7, 3, 6, 8, 4, 2, 1, 0]; n = 0; for (i=0, nn, n = 10*n+ v[(i % 18)+1]; if (ispseudoprime(n), print1(n, ", ")); ); } \\ Michel Marcus, May 27 2014

Crossrefs

Cf. A021023.

Corresponding sequences for 1/k: A242824 (k=7), A093676 (k=12), A242826 (k=13), A242827(k=14), A242828 (k=17).

Sequence in context: A167369 A259161 A356762 * A242478 A247845 A050816

Adjacent sequences: A242830 A242831 A242832 * A242834 A242835 A242836

Keyword

base,nonn

Author

Felix Fröhlich, May 23 2014

Status

approved