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A103547
a(n) is the smallest n-digit zeroless prime such that the sum of the two numbers that result from splitting a(n) between any two of its digits is a distinct prime, or 0 if there is no such n-digit prime.
0
11, 281, 2267, 26881, 464447, 6462667, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
OFFSET
2,1
COMMENTS
The last digit is always odd and every other digit is even (except for a(1) = 11). - Sean A. Irvine, Apr 11 2010
EXAMPLE
a(4) = 2267. 2 + 267 = 269, which is prime. 22 + 67 = 89, which is prime. 226 + 7 = 233, which is prime.
a(2) is NOT 227 because 2 + 27 = 29 and 22 + 7 = 29 are the same prime. [From Sean A. Irvine, Apr 11 2010]
CROSSREFS
Sequence in context: A049080 A210807 A129754 * A171195 A274780 A323311
KEYWORD
base,more,nonn
AUTHOR
Ray G. Opao, Mar 23 2005
EXTENSIONS
More terms from Sean A. Irvine, Apr 11 2010
a(13)-a(18) from Hiroaki Yamanouchi, Aug 31 2014
STATUS
approved