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A078830
Numbers having in binary representation exactly one binary substring representing a prime.
2
2, 3, 4, 8, 9, 16, 32, 33, 64, 65, 128, 129, 256, 512, 513, 1024, 1025, 2048, 2049, 4096, 4097, 8192, 8193, 16384, 16385, 32768, 32769, 65536, 131072, 131073, 262144, 262145, 524288, 524289, 1048576, 1048577, 2097152, 2097153, 4194304, 4194305
OFFSET
1,1
COMMENTS
A078827(a(n)) = 1; subsequence of A078829 and of A078831;
for k>2 also floor(a(k)/2) belongs to the sequence.
EXAMPLE
p=2 -> '10' is the only prime contained exactly once in 2^k, k>0.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Reinhard Zumkeller, Dec 08 2002
EXTENSIONS
Extended by Ray Chandler, Nov 03 2008
STATUS
approved