OFFSET
0,1
LINKS
Harvey P. Dale, Table of n, a(n) for n = 0..499
Chris Caldwell The First 10,000 Primes
EXAMPLE
27 is obtained by concatenating the smallest 1-digit prime and the largest 1-digit prime.
1197 is obtained by concatenating the smallest 2-digit prime and the largest 2-digit prime.
MAPLE
for n from 0 to 30 do for m from 1 to 10^(n+1)-1 do if isprime(10^n + m) then printf(`%d`, 10^n+m); break; fi: od: for m from 1 to 10^(n+1)-1 do if isprime(10^(n+1) - m) then printf(`%d`, 10^(n+1)-m); break; fi: od: printf(`, `): od: # James A. Sellers, May 02 2005
MATHEMATICA
FromDigits/@Table[Flatten[{IntegerDigits[NextPrime[10^n]], IntegerDigits[ NextPrime[ 10^(n+1), -1]]}], {n, 0, 15}] (* Harvey P. Dale, Aug 06 2013 *)
CROSSREFS
KEYWORD
nonn,base,less
AUTHOR
Parthasarathy Nambi, Apr 01 2005
EXTENSIONS
More terms from James A. Sellers, May 02 2005
Edited by Charles R Greathouse IV, Apr 27 2010
More terms from Harvey P. Dale, Aug 06 2013
STATUS
approved