A158245 Primitive numbers in A158235.

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.

Links

Table of n, a(n) for n=1..39.

Example

105339^2 = 333 in base 60817.

Crossrefs

Sequence in context: A153368 A068600 A158235 * A076851 A164576 A058497

Adjacent sequences: A158242 A158243 A158244 * A158246 A158247 A158248

Keyword

nonn

Author

T. D. Noe, Mar 14 2009

Status

approved