|
| |
|
|
A046852
|
|
Numerator of sum of reciprocals of first n palindromic primes.
|
|
2
| |
|
|
1, 5, 31, 247, 2927, 297937, 39263057, 5959285217, 1083245729387, 207735268337827, 65180687788497661, 23058721563350868863, 8618531530355825754989, 3307472964561561236731357
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,2
|
|
|
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]]; Numerator[ Accumulate[1/#&/@Select[Prime[Range[200]], palQ]]] (* From Harvey P. Dale, Dec 21 2011 *)
|
|
|
CROSSREFS
| Cf. A046853, A002385.
Sequence in context: A186859 A082579 A024451 * A056541 A126121 A167137
Adjacent sequences: A046849 A046850 A046851 * A046853 A046854 A046855
|
|
|
KEYWORD
| nonn,base
|
|
|
AUTHOR
| G. L. Honaker, Jr. (honak3r(AT)gmail.com)
|
|
|
EXTENSIONS
| More terms from Erich Friedman (efriedma(AT)stetson.edu), Jun 03 2001
|
| |
|
|
