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A060471
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Smallest positive a(n) such that number of solutions to a(n)=a(j)+a(k) j<k<n is three or less.
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4
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1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 16, 19, 21, 23, 25, 30, 32, 34, 36, 41, 43, 45, 47, 52, 54, 56, 58, 63, 65, 67, 69, 74, 76, 78, 80, 85, 87, 89, 91, 96, 98, 100, 102, 107, 109, 111, 113, 118, 120, 122, 124, 129, 131, 133, 135, 140, 142, 144, 146, 151, 153, 155, 157
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Numbers {1,3,8,10} mod 11 plus {2,4,5,6,7,16}. Note that while the cases for "zero", "one", "two" and "four" essentially involve a third of the natural numbers, this case for "three" involves 4/11.
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EXAMPLE
| 12 is in the sequence since it is 5+7, 4+8 and 2+10 but no other sum of two distinct terms.
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CROSSREFS
| Cf. A033627, A060469, A060470, A060471, A060472.
Sequence in context: A022788 A141340 A033060 * A003045 A029750 A173925
Adjacent sequences: A060468 A060469 A060470 * A060472 A060473 A060474
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KEYWORD
| nonn
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AUTHOR
| Henry Bottomley (se16(AT)btinternet.com), Mar 15 2001
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