|
Search: id:A068646
|
|
|
| A068646 |
|
Primes in which a string of 5's is sandwiched between two 1's. |
|
+0
6
|
|
| 11, 151, 15551, 155555555555555555551, 155555555555555555555555555555551
(list; graph; listen)
|
|
|
OFFSET
|
0,1
|
|
|
EXAMPLE
|
11 is also a member in which a string of 0 5's is there between two one's.
|
|
MAPLE
|
a := 1:b := 5:i := 1:for n from 0 to 500 do c := a+10*(10^n-1)/9*b+10^(n+1)*a; if(isprime(c)) then d[i] := c; i := i+1; end if; end do:q := seq(d[j], j=1..i-1);
|
|
CROSSREFS
|
Cf. A068645.
Sequence in context: A103544 A038141 A142083 this_sequence A077577 A157186 A122769
Adjacent sequences: A068643 A068644 A068645 this_sequence A068647 A068648 A068649
|
|
KEYWORD
|
base,nonn
|
|
AUTHOR
|
Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Feb 28 2002
|
|
EXTENSIONS
|
More terms from Sascha Kurz (sascha.kurz(AT)uni-bayreuth.de), Mar 19 2002. The next term is too big to include.
|
|
|
Search completed in 0.002 seconds
|
