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A102237
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Smallest number equal to the product of n primes which is also equal to the sum of n distinct primes.
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0
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2, 9, 12, 36, 48, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536, 131072, 262144, 524288, 1048576, 2097152, 4194304, 8388608, 16777216, 33554432, 67108864, 134217728, 268435456, 536870912, 1073741824, 2147483648
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Conjecture: a(n) = 2^n for n>5. (Chandler)
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EXAMPLE
| a(1) = 2;
a(2) = 9 = 3*3 = 2+7;
a(3) = 12 = 2*2*3 = 2+3+7;
a(4) = 36 = 2*2*3*3 = 3+5+11+17;
a(5) = 48 = 2*2*2*2*3 = 2+3+5+7+31.
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CROSSREFS
| Sequence in context: A183207 A178312 A126977 * A076505 A129345 A125019
Adjacent sequences: A102234 A102235 A102236 * A102238 A102239 A102240
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KEYWORD
| nonn
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AUTHOR
| Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Feb 18 2005
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EXTENSIONS
| Corrected and extended by Ray Chandler (rayjchandler(AT)sbcglobal.net) Feb 25 2005
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