OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..100
EXAMPLE
1/2 + 1/3 + 1/5 + 1/7 + 1/11 + 1/101 + ... gives 1/2, 5/6, 31/30, 247/210, ...
MATHEMATICA
palQ[n_]:=Module[{idn=IntegerDigits[n]}, idn==Reverse[idn]]; Denominator[Accumulate[1/#&/@Select[Prime[Range[100]], palQ]] (* Vincenzo Librandi, Dec 30 2011 *)
Accumulate[1/Select[Prime[Range[100]], PalindromeQ]]//Denominator (* Harvey P. Dale, Jul 24 2021 *)
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
EXTENSIONS
More terms from Erich Friedman, Jun 03 2001
STATUS
approved