A179918 Primes with ten embedded primes.

23719, 31379, 52379, 111373, 111731, 111733, 112397, 113117, 113167, 113723, 113759, 113761, 115237, 117191, 117431, 121139, 122971, 123113, 123373, 123479, 123731, 124337, 126173, 126317, 127139, 127733, 127739, 127973, 129733, 131171

Offset

1,1

Comments

A079066(a(n)) = 10.

Links

Table of n, a(n) for n=1..30.

Mathematica

f[n_] := Block[ {id = IntegerDigits@n}, len = Length@ id - 1; Count[ PrimeQ@ Union[ FromDigits@# & /@ Flatten[ Table[ Partition[ id, k, 1], {k, len}], 1]], True] + 1]; Select[ Prime@ Range@ 12280, f@# == 11 &]

Prog

(Haskell)
import Data.List (elemIndices)
a179918 n = a179918_list !! (n-1)
a179918_list = map (a000040 . (+ 1)) $ elemIndices 10 a079066_list
-- Reinhard Zumkeller, Jul 19 2011

Crossrefs

Cf. A039996, A079397, A033274, A034844, A092621, A179909 - A179919, A033274.

Sequence in context: A251855 A200437 A223342 * A168169 A344377 A031649

Adjacent sequences: A179915 A179916 A179917 * A179919 A179920 A179921

Keyword

base,nonn

Author

Robert G. Wilson v, Aug 01 2010

Status

approved