|
| |
|
|
A092025
|
|
Numbers n such that the concatenation of the first n natural numbers plus prime(n) is prime.
|
|
0
| | |
|
|
|
OFFSET
| 1,2
|
|
|
COMMENTS
| For n > 1, a(n) is even.
|
|
|
EXAMPLE
| 66 is in the sequence because 1.2.3...65.66 + prime(66) is prime.
|
|
|
CROSSREFS
| Sequence in context: A029690 A067737 A111494 * A156812 A171665 A049103
Adjacent sequences: A092022 A092023 A092024 * A092026 A092027 A092028
|
|
|
KEYWORD
| more,nonn,base
|
|
|
AUTHOR
| Farideh Firoozbakht (mymontain(AT)yahoo.com), Feb 19 2004
|
|
|
EXTENSIONS
| Edited by Charles R Greathouse IV (charles.greathouse(AT)case.edu), Apr 29 2010
a(6) from Max Alekseyev (maxale(AT)gmail.com), Jan 28 2012
|
| |
|
|
