A261510 Triangle-congruent primes greater than 10 with a single digit at the center.

1111211111, 1111411111, 3333133333, 9999499999, 1111111111112111111111111111, 1111311331137311333311111111, 1111411441142411444411111111, 1111611661167611666611111111, 1111811881185811888811111111, 3333033003305033000033333333, 3333133113312133111133333333

Offset

1,1

Comments

Subsequence of A050758.

Links

Table of n, a(n) for n=1..11.

G. L. Honaker, Jr. and C. Caldwell, 1111211111

Example

a(6) can be represented as follows:
......1
.....1 1
....1 3 1
...1 3 3 1
..1 3 7 3 1
.1 3 3 3 3 1
1 1 1 1 1 1 1

Crossrefs

Cf. A050758.

Sequence in context: A272029 A095425 A038452 * A034650 A035525 A337487

Adjacent sequences: A261507 A261508 A261509 * A261511 A261512 A261513

Keyword

nonn,base

Author

Felix Fröhlich, Aug 22 2015

Status

approved