OFFSET
1,1
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
MATHEMATICA
sfl[p_]:=Module[{idn=IntegerDigits[p]}, idn[[1]]+idn[[-1]]]; sfl/@Prime[Range[90]] (* Harvey P. Dale, Jan 31 2023 *)
CROSSREFS
KEYWORD
easy,nonn,base
AUTHOR
Zak Seidov, Sep 20 2003
STATUS
approved