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A109825
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Initial terms of groups in the partition of the sequence of natural numbers A109411.
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3
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1, 4, 5, 9, 10, 11, 16, 18, 21, 22, 23, 36, 39, 40, 43, 45, 47, 49, 50, 54, 60, 62, 63, 69, 70, 72, 74, 75, 89, 93, 94, 95, 96, 99, 104, 106, 107, 109, 111, 112, 115, 116, 126, 128, 135, 140, 144, 146, 147, 149, 151, 153, 159, 160, 162, 165, 170, 172, 175, 179, 184, 190
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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MATHEMATICA
| s={1}; a=1; Do[Do[If[Plus@@Last/@FactorInteger[(a+x)(x-a+1)/2]==2, a=x+1; AppendTo[s, a]; Break[]], {x, a, 20000}], {k, 1, 100}]; A109825=s
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CROSSREFS
| Cf. A109411, A109826.
Sequence in context: A115915 A007536 A064801 * A193259 A008935 A003995
Adjacent sequences: A109822 A109823 A109824 * A109826 A109827 A109828
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KEYWORD
| nonn
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AUTHOR
| Zak Seidov (zakseidov(AT)yahoo.com), Jul 03 2005
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