|
| |
|
|
A048756
|
|
Prime repunits in ascending prime bases (written in decimal).
|
|
0
| | |
|
|
|
OFFSET
| 1,1
|
|
|
COMMENTS
| 2^2-1=3 is prime; (3^3-1)/2=13 is prime; (5^13-1)/4=305175781 is prime; the next term is too gigantic to be computed simply.
|
|
|
FORMULA
| a(p)=((p^a(p-1))-1)/(p-1); a(p)=111...111 in base p with a(p-1) 1's; p runs though the primes.
|
|
|
CROSSREFS
| Sequence in context: A007523 A092830 A087345 * A174211 A157323 A016549
Adjacent sequences: A048753 A048754 A048755 * A048757 A048758 A048759
|
|
|
KEYWORD
| nonn,bref
|
|
|
AUTHOR
| Xavier Labouze (Xavier.Labouze(AT)cep.u-psud.fr)
|
| |
|
|
