

A057613


Numbers that are both lucky numbers (A000959) and of form 2^k1 (A000225).


0



1, 3, 7, 15, 31, 63, 127, 511, 1023, 4095, 8191, 131071, 524287, 2097151, 4194303, 8388607, 33554431, 67108863, 8589934591
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OFFSET

1,2


COMMENTS



LINKS



EXAMPLE

a(7) = 127 since A000959(27) = A000225(7) = 127 and it is the 7th such number with this property.


CROSSREFS



KEYWORD

nonn,more


AUTHOR



EXTENSIONS

More terms from Mark Weston (mweston(AT)uvic.ca), Oct 16 2001


STATUS

approved



