login
A158245
Primitive numbers in A158235.
2
11, 20, 39, 49, 133, 247, 543, 1218, 1651, 1729, 2289, 3097, 4171, 4503, 6231, 7303, 7540, 7563, 8773, 9139, 12439, 16627, 16761, 17157, 20280, 22021, 22393, 37051, 37209, 37387, 45201, 47257, 51961, 65379, 66211, 69601, 100191, 103861, 105339
OFFSET
1,1
COMMENTS
The primitive terms in A158235 are the ones for which the repdigit is squarefree. Hence n^2 = d*(b^k-1)/(b-1) with d squarefree and d<b<n.
EXAMPLE
105339^2 = 333 in base 60817.
CROSSREFS
Sequence in context: A153368 A068600 A158235 * A076851 A164576 A058497
KEYWORD
nonn
AUTHOR
T. D. Noe, Mar 14 2009
STATUS
approved