A090419 Numbers that cannot be written in binary representation as concatenation of primes.

1, 4, 6, 8, 9, 12, 16, 18, 20, 24, 25, 26, 27, 28, 32, 33, 34, 35, 36, 38, 39, 40, 44, 48, 49, 50, 51, 52, 56, 57, 60, 64, 65, 66, 68, 69, 72, 74, 75, 76, 77, 80, 82, 84, 88, 92, 96, 98, 99, 100, 102, 104, 105, 106, 108, 110, 112, 114, 116, 120, 121, 124

Offset: 1

Author

Reinhard Zumkeller, Nov 30 2003

Keywords

• nonn
• base

Comments

A090418(a(n)) = 0; complement of A090421.

Links

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

Crossrefs

Cf. A004676, A007088.

Programs

Haskell

a090419 n = a090419_list !! (n-1)
a090419_list = filter ((== 0) . a090418) [1..]
-- Reinhard Zumkeller, Aug 06 2012

Extensions

Based on corrections in A090418, data recomputed by Reinhard Zumkeller, Aug 06 2012