|
Search: id:A099077
|
|
|
| A099077 |
|
Numbers n such that pi(1).pi(2) ... pi(n-1).pi(n) is prime (dot between numbers means concatenation). |
|
+0
4
|
| |
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
Number of digits of primes corresponding to the four known terms of this sequence are respectively 4,24,6127,13111. Next term is greater than 10250 and the prime corresponding to the next term has more than 32500 digits.
|
|
LINKS
|
Eric Weisstein ,A Section of The World of Mathematics
C. Rivera, ,Primes by Listing, The Prime Puzzles & Problems connection.
|
|
EXAMPLE
|
5 is in the sequence because pi(1).pi(2).pi(3).pi(4).pi(5)=1223 is prime.
|
|
CROSSREFS
|
Cf. A046035, A099078, A099079, A099080.
Sequence in context: A067212 A061583 A039780 this_sequence A137113 A137115 A060063
Adjacent sequences: A099074 A099075 A099076 this_sequence A099078 A099079 A099080
|
|
KEYWORD
|
base,more,nonn
|
|
AUTHOR
|
Farideh Firoozbakht (f.firoozbakht(AT)math.ui.ac.ir), Oct 23 2004
|
|
|
Search completed in 0.002 seconds
|
