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A097214
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Numbers n such that A076078(n) = n, where A076078(n) equals the number of sets of distinct positive integers with a least common multiple of n.
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2
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1, 2, 4, 8, 10, 16, 32, 44, 64, 128, 184, 256, 512, 752, 1024, 2048, 4096, 8192, 12224, 16384, 32768, 49024, 61064, 65536, 131072, 262124, 524288, 981520, 1048576, 2097152, 4194304, 8388608, 12580864, 16777216, 33554432, 67108864, 134217728
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Contains all powers of 2 (A000079). Union of A000079 and A097215.
If 3*2^n-1 is prime then 2^n*(3*2^n-1) is in the sequence. So 2^A002235*(3*2^A002235-1) is a subsequence of this sequence. - Farideh Firoozbakht (mymontain(AT)yahoo.com), Aug 06 2005
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EXAMPLE
| A total of 10 sets of distinct positive integers have a least common multiple of 10: 1,2,5; 1,2,5,10; 1,2,10; 1,5,10; 1,10; 2,5; 2,5,10; 2,10; 5,10; and 10. Hence 10 is in the sequence.
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CROSSREFS
| Cf. A097215
Cf. A002235.
Sequence in context: A045795 A083655 A097210 * A045579 A177050 A173063
Adjacent sequences: A097211 A097212 A097213 * A097215 A097216 A097217
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KEYWORD
| nonn
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AUTHOR
| Matthew Vandermast (ghodges14(AT)comcast.net), Aug 12 2004
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