|
Search: id:A108841
|
|
|
| A108841 |
|
Primes such that the outer 2 digits are n and all inner digits are 4, where 0 < n < 9. |
|
+0
1
|
|
| 1444441, 3444443, 74444444447, 3444444444443, 7444444444444444444444444444447, 1444444444444444444444444444444444444444444444444444444444444444441
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
These primes are palindromic.
|
|
PROGRAM
|
(PARI) n10np1(n, d) = { local(x, y, k); for(x=1, n, for(k=1, 8, y=10^(x+1)*k+floor(10^x*d/9)*10+k; if(isprime(y), print1(y", ")) ) ) }
|
|
CROSSREFS
|
Adjacent sequences: A108838 A108839 A108840 this_sequence A108842 A108843 A108844
Sequence in context: A064871 A054852 A015361 this_sequence A124490 A124491 A003939
|
|
KEYWORD
|
easy,nonn,base
|
|
AUTHOR
|
Cino Hilliard (hillcino368(AT)gmail.com), Jul 11 2005
|
|
|
Search completed in 0.002 seconds
|
