|
Search: id:A030471
|
|
|
| A030471 |
|
Primes which are concatenations of four consecutive numbers. |
|
+0
4
|
|
| 4567, 14151617, 20212223, 34353637, 58596061, 64656667, 118119120121, 140141142143, 148149150151, 176177178179, 196197198199, 218219220221, 220221222223, 236237238239, 238239240241, 268269270271, 278279280281
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
MAPLE
|
P:=proc(i) local a, n; for n from 0 by 1 to i do a=n*10^(trunc(evalf(log10(n+1)+1))+trunc(evalf(log10(n+2)+1))+trunc(evalf(log10(\ n+3)+1)))+(n+1)*10^(trunc(evalf(log10(n+2)+1))+trunc(evalf(log10(n+3)+1)))+(n+2)\ *10^(trunc(evalf(log10(n+3)+1)))+n+3; if isprime(a) then print(a); fi; od; end: P(1000); [From Paolo P. Lava (ppl(AT)spl.at), Oct 01 2008]
|
|
CROSSREFS
|
Sequence in context: A032751 A020436 A104947 this_sequence A068756 A004537 A032745
Adjacent sequences: A030468 A030469 A030470 this_sequence A030472 A030473 A030474
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Patrick De Geest (pdg(AT)worldofnumbers.com)
|
|
|
Search completed in 0.002 seconds
|
