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A090420 Numbers having a unique representation as concatenation of primes in binary. 3

%I #10 Jul 13 2013 12:03:10

%S 2,3,5,7,10,13,14,15,17,19,21,22,30,37,41,42,53,54,55,58,62,67,70,73,

%T 78,81,85,86,89,90,97,101,103,107,111,115,117,122,131,137,139,141,143,

%U 149,150,159,163,165,166,169,170,177,193,197,199,211,214,215,218

%N Numbers having a unique representation as concatenation of primes in binary.

%C A090418(a(n)) = 1; subsequence of A090421.

%H Reinhard Zumkeller, <a href="/A090420/b090420.txt">Table of n, a(n) for n = 1..10000</a>

%o (Haskell)

%o a090420 n = a090420_list !! (n-1)

%o a090420_list = filter ((== 1) . a090418) [1..]

%o -- _Reinhard Zumkeller_, Aug 07 2012

%Y Cf. A004676, A007088.

%Y Cf. A090423 (subsequence).

%K nonn,base

%O 1,1

%A _Reinhard Zumkeller_, Nov 30 2003

%E Based on corrections in A090418, data recomputed by _Reinhard Zumkeller_, Aug 07 2012

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Last modified March 4 21:29 EST 2024. Contains 370532 sequences. (Running on oeis4.)