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Search: id:A090420
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A090420 Numbers having a unique representation as concatenation of primes in binary. +0
3
2, 3, 5, 7, 13, 15, 17, 19, 21, 37, 41, 53, 55, 67, 73, 81, 89, 91, 97, 101, 103, 107, 111, 115, 123, 131, 137, 139, 141, 143, 149, 159, 163, 165, 169, 171, 177, 193, 197, 199, 211, 215, 219, 221, 227, 235, 243, 245, 257, 263, 269, 277, 281, 285, 293, 295, 301 (list; graph; listen)
OFFSET

1,1

COMMENT

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

CROSSREFS

Cf. A004676, A007088.

Sequence in context: A067836 A108546 A065107 this_sequence A031344 A004682 A024783

Adjacent sequences: A090417 A090418 A090419 this_sequence A090421 A090422 A090423

KEYWORD

nonn,base

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Nov 30 2003

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.


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