|
| |
|
|
A096101
|
|
a(1) = 1; for n > 1: a(n) = smallest number >1 such that product of any two or more successive terms - 1 is prime.
|
|
1
| | |
|
|
|
OFFSET
| 1,2
|
|
|
COMMENTS
| Next term > 20000000 if it exists.
|
|
|
EXAMPLE
| a(2) is not 2 since 1*2-1 = 1 is not prime, but 1*3-1 = 2 is prime, hence a(2) = 3. a(6) is not 2 since 2*2*2*2-1 = 15 is not prime, but 2*3-1 = 5, 2*2*3-1 = 11, 2*2*2*3-1 = 23, 3*2*2*2*3-1 = 71 are all prime, hence a(6) = 3.
|
|
|
CROSSREFS
| Cf. A096100.
Sequence in context: A141070 A163751 A067279 * A104890 A064123 A024703
Adjacent sequences: A096098 A096099 A096100 * A096102 A096103 A096104
|
|
|
KEYWORD
| more,nonn
|
|
|
AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jun 24 2004
|
|
|
EXTENSIONS
| Edited and extended by Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Jul 05 2004
a(10) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Apr 22 2008
|
| |
|
|
