|
| |
|
|
A179909
|
|
Primes with only one embedded prime.
|
|
15
|
|
|
|
13, 17, 29, 31, 43, 47, 59, 67, 71, 79, 83, 97, 103, 107, 151, 163, 191, 199, 269, 281, 349, 421, 461, 463, 487, 509, 569, 607, 641, 661, 701, 709, 769, 787, 811, 821, 863, 877, 887, 907, 911, 919, 941, 1021, 1051, 1061, 1063, 1087, 1091, 1201, 1249, 1409
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,1
|
|
|
COMMENTS
|
A079066(a(n)) = 1.
|
|
|
LINKS
|
Reinhard Zumkeller, Table of n, a(n) for n = 1..1000
|
|
|
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@ 230, f@# == 2 &]
|
|
|
PROG
|
(Haskell)
import Data.List (elemIndices)
a179909 n = a179909_list !! (n-1)
a179909_list = map (a000040 . (+ 1)) $ elemIndices 1 a079066_list
-- Reinhard Zumkeller, Jul 19 2011
|
|
|
CROSSREFS
|
Cf. A039996, A079397, A033274, A034844, A092621, A179909 - A179919, A033274.
Sequence in context: A164074 A152426 A152427 * A220488 A092626 A156343
Adjacent sequences: A179906 A179907 A179908 * A179910 A179911 A179912
|
|
|
KEYWORD
|
base,nonn
|
|
|
AUTHOR
|
Robert G. Wilson v, Aug 01 2010
|
|
|
STATUS
|
approved
|
| |
|
|
