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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; text; 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]]] (* Harvey P. Dale, Dec 21 2011 *)

CROSSREFS

Cf. A046853, A002385.

Sequence in context: A261498 A276312 A024451 * A056541 A291885 A126121

Adjacent sequences:  A046849 A046850 A046851 * A046853 A046854 A046855

KEYWORD

nonn,frac,base

AUTHOR

G. L. Honaker, Jr.

EXTENSIONS

More terms from Erich Friedman, Jun 03 2001

STATUS

approved

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Last modified January 22 22:38 EST 2018. Contains 298093 sequences.