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A088135
Sum of first and last digits of n-th prime.
7
4, 6, 10, 14, 2, 4, 8, 10, 5, 11, 4, 10, 5, 7, 11, 8, 14, 7, 13, 8, 10, 16, 11, 17, 16, 2, 4, 8, 10, 4, 8, 2, 8, 10, 10, 2, 8, 4, 8, 4, 10, 2, 2, 4, 8, 10, 3, 5, 9, 11, 5, 11, 3, 3, 9, 5, 11, 3, 9, 3, 5, 5, 10, 4, 6, 10, 4, 10, 10, 12, 6, 12, 10, 6, 12, 6, 12, 10, 5, 13, 13, 5, 5, 7, 13, 7, 13
OFFSET
1,1
LINKS
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