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A030471
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Primes which are concatenations of four consecutive numbers.
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3
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4567, 14151617, 20212223, 34353637, 58596061, 64656667, 118119120121, 140141142143, 148149150151, 176177178179, 196197198199, 218219220221, 220221222223, 236237238239, 238239240241, 268269270271, 278279280281
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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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 (paoloplava(AT)gmail.com), Oct 01 2008]
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CROSSREFS
| Sequence in context: A032751 A020436 A104947 * A068756 A205231 A185470
Adjacent sequences: A030468 A030469 A030470 * A030472 A030473 A030474
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KEYWORD
| nonn,base
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AUTHOR
| Patrick De Geest (pdg(AT)worldofnumbers.com)
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EXTENSIONS
| Edited by Charles R Greathouse IV (charles.greathouse(AT)case.edu), Apr 23 2010
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