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

1,1

Comments

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

Links

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

Prog

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

Crossrefs

Cf. A004676, A007088.

Cf. A090423 (subsequence).

Sequence in context: A109598 A117959 A117952 * A162999 A064509 A096221

Adjacent sequences: A090417 A090418 A090419 * A090421 A090422 A090423

Keyword

nonn,base

Author

Reinhard Zumkeller, Nov 30 2003

Extensions

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

Status

approved