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

2, 3, 5, 7, 10, 13, 14, 15, 17, 19, 21, 22, 30, 37, 41, 42, 53, 54, 55, 58, 62, 67, 70, 73, 78, 81, 85, 86, 89, 90, 97, 101, 103, 107, 111, 115, 117, 122, 131, 137, 139, 141, 143, 149, 150, 159, 163, 165, 166, 169, 170, 177, 193, 197, 199, 211, 214, 215, 218

Offset: 1

Author

Reinhard Zumkeller, Nov 30 2003

Keywords

• nonn
• base

Comments

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

Links

• Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A004676, A007088.

Cf. A090423 (subsequence).

Programs

Haskell

a090420 n = a090420_list !! (n-1)
a090420_list = filter ((== 1) . a090418) [1..]
-- Reinhard Zumkeller, Aug 07 2012

Extensions

Based on corrections in A090418, data recomputed by Reinhard Zumkeller, Aug 07 2012