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Search: id:A094551
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| A094551 |
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Numbers n such that there are integers a < b with a+(a+1)+...+(n-1) = n+(n+1)+...+b. |
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+0
4
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| 3, 7, 8, 9, 13, 15, 18, 19, 20, 21, 23, 26, 27, 28, 31, 33, 37, 38, 43, 44, 45, 46, 48, 49, 51, 53, 55, 56, 57, 58, 59, 60, 62, 63, 68, 69, 72, 73, 75, 77, 78, 79, 80, 83, 85, 87, 88, 91, 92, 93, 94, 97, 98, 99, 102, 103, 108, 110, 111, 113, 115, 117, 118, 121, 123, 124, 128
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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7 is in this sequence because 4+5+6 = 7+8.
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MATHEMATICA
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lst={}; Do[i1=n-1; i2=n; s1=i1; s2=i2; While[i1>1 && s1!=s2, If[s1<s2, i1--; s1=s1+i1, i2++; s2=s2+i2]]; If[s1==s2, AppendTo[lst, n]], {n, 2, 140}]; lst
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CROSSREFS
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Cf. A094550, A094552, A094553.
Sequence in context: A096315 A112680 A096079 this_sequence A114441 A043046 A030674
Adjacent sequences: A094548 A094549 A094550 this_sequence A094552 A094553 A094554
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KEYWORD
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nonn
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AUTHOR
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T. D. Noe (noe(AT)sspectra.com), May 10 2004
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