|
Search: id:A128027
|
|
|
| A128027 |
|
Numbers n such that (11^n - 3^n)/8 is prime. |
|
+0
21
|
| |
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
All terms are primes.
|
|
MATHEMATICA
|
k=8; Select[ Prime[ Range[1, 200] ], PrimeQ[ ((k+3)^# - 3^#)/k ]& ]
Do[If[PrimeQ[(11^n - 3^n)/8], Print[n]], {n, 10^4}] - Ryan Propper (rpropper(AT)stanford.edu), Mar 17 2007
|
|
CROSSREFS
|
Cf. A028491 = numbers n such that (3^n - 1)/2 is prime. Cf. A057468 = numbers n such that 3^n - 2^n is prime. Cf. A059801 = numbers n such that 4^n - 3^n is prime. Cf. A121877 = numbers n such that (5^n - 3^n)/2 is a prime. Cf. A128024, A128025, A128026, A128028, A128029, A128030, A128031, A128032.
Sequence in context: A088785 A068990 A062594 this_sequence A128066 A148523 A148524
Adjacent sequences: A128024 A128025 A128026 this_sequence A128028 A128029 A128030
|
|
KEYWORD
|
hard,more,nonn
|
|
AUTHOR
|
Alexander Adamchuk (alex(AT)kolmogorov.com), Feb 11 2007
|
|
EXTENSIONS
|
a(8) from Ryan Propper (rpropper(AT)stanford.edu), Mar 17 2007
a(9) from Farideh Firoozbakht (mymontain(AT)yahoo.com), Apr 04 2007
|
|
|
Search completed in 0.002 seconds
|
