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A090424
Smallest number that can be written in binary representation as concatenation of other primes in exactly n ways.
2
2, 11, 23, 47, 175, 95, 189, 375, 191, 381, 763, 1015, 751, 383, 765, 1023, 1407, 2045, 767, 8123, 1919, 5999, 1533, 5623, 4063, 3067, 3007, 3039, 1535, 6013, 6077, 8183, 7935, 11247, 3069, 12023, 12143, 6139, 6015, 6111, 6127, 3071, 6079, 6135, 7679, 32507
OFFSET
1,1
COMMENTS
A090418(a(n)) = n and A090418(m) <> n for m < a(n).
LINKS
EXAMPLE
n=6: a(6)=95 -> '1011111': '10"11111'==2"31, '10"11"111'==2"3"7, '10"111"11'==2"7"3, '101"11"11'==5"3"3, '1011"111'==11"7 and '10111"11'==23"3, therefore A090418(95)=6.
PROG
(Haskell)
import Data.List (elemIndex)
import Data.Maybe (fromJust)
a090424 = (+ 1) . fromJust . (`elemIndex` a090418_list)
-- Reinhard Zumkeller, Aug 07 2012
CROSSREFS
Sequence in context: A294551 A179878 A126916 * A056637 A141423 A344032
KEYWORD
nonn,base
AUTHOR
Reinhard Zumkeller, Nov 30 2003
EXTENSIONS
Based on corrections of A090418, data recomputed by Reinhard Zumkeller, Aug 07 2012
STATUS
approved