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A179912 Primes with four embedded primes. 2
137, 173, 317, 373, 379, 523, 673, 1123, 1153, 1171, 1193, 1223, 1231, 1277, 1279, 1283, 1297, 1307, 1327, 1531, 1579, 1597, 1613, 1637, 1759, 1783, 1823, 1913, 1931, 2053, 2153, 2333, 2339, 2341, 2351, 2393, 2399, 2411, 2467, 2503, 2539, 2543, 2557 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

A079066(a(n)) = 4.

LINKS

Table of n, a(n) for n=1..43.

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@ 380, f@# == 5 &]

PROG

(Haskell)

import Data.List (elemIndices)

a179912 n = a179912_list !! (n-1)

a179912_list = map (a000040 . (+ 1)) $ elemIndices 4 a079066_list

-- Reinhard Zumkeller, Jul 19 2011

CROSSREFS

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

Sequence in context: A139647 A114645 A057879 * A108382 A106280 A139510

Adjacent sequences:  A179909 A179910 A179911 * A179913 A179914 A179915

KEYWORD

base,nonn

AUTHOR

Robert G. Wilson v, Aug 01 2010

STATUS

approved

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Last modified November 20 21:03 EST 2019. Contains 329348 sequences. (Running on oeis4.)