OFFSET
1,1
COMMENTS
The first digit and the smallest digit may be the same digit. - Harvey P. Dale, Sep 23 2021
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..2000
EXAMPLE
11(1+1=2=prime), 13(1+1=2=prime), 17(1+1=2=prime), 19(1+1=2=prime), 41(4+1=5=prime), 43(4+3=7=prime), etc.
MATHEMATICA
Select[Prime[Range[150]], PrimeQ[Min[IntegerDigits[#]]+IntegerDigits[#][[1]]]&] (* Harvey P. Dale, Sep 23 2021 *)
CROSSREFS
KEYWORD
nonn,base,less
AUTHOR
Juri-Stepan Gerasimov, Feb 24 2009
EXTENSIONS
197 and 241 inserted by R. J. Mathar, Feb 26 2009
STATUS
approved