Williams primes of the form 11•12ⁿ-1

2015-03-20: Checked to n = 200000 , <a href="/z/index.php?title=Robert_Price&amp;action=edit&amp;redlink=1" class="new" title="Robert Price (page does not exist)">Robert Price
2006-10-30: Checked to n = 5000 , Hugo Platzer
2003: Found n =&#160;1566 , <a href="/z/index.php?title=Robert_G._Wilson&amp;action=edit&amp;redlink=1" class="new" title="Robert G. Wilson (page does not exist)">Robert G. Wilson

Current data

1, 2, 21, 25, 33, 54, 78, 235, 1566, 2273, 2310, 4121, 7775, 42249, 105974, 138961

Remarks :

The sequence A079907 in OEIS