[seqfan] Re: A170817, A170818 xref suggested

[Maximilian Hasler]

On Wed, Dec 23, 2009 at 2:51 PM, Jonathan Post <jvospost3 at gmail.com> wrote:
> A170818
> A170817
>
> Other than the trivial 11 in each case, no initial substring
> concatenation of the digits shown yields a prime.

the following  concatenations of initial terms of A170817 are prime:
11, 11115111151113151171151111513,
1111511115111315117115111151311295111175137113541111,
(next term has > 1000 digits)

for the =3[4] version there are (as expected) more :

11, 113, 11311, 113113713111317311,
11311371311131731131912111233113713311331731193,
(next term has > 1000 digits)

Maximilian