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Search: id:A103791
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| 2, 4, 8, 29, 24, 78, 65, 90, 449, 280, 400, 124, 935, 589, 1743, 325, 2001, 2863, 3150, 2026, 5680, 5156, 4016, 10403, 22626, 2358, 19242, 14356, 19543, 7666, 20555, 29104, 64045, 56438, 84993, 15346, 37400, 13663, 83487, 58651, 162225, 111880
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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A103790(2)=1*2*1-1; => a(1)=2
A103790(4)=3*2*2-1; => a(2)=4
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MATHEMATICA
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A019565 = Function[tn, k1 = tn; o = 1; tt = 1; While[k1 > 0, k2 = Mod[k1, 2]; If[k2 == 1, tt = tt*Prime[o]]; k1 = (k1 - k2)/2; o = o + 1]; tt]; Array[fa, {1, 500}]; Do[fa[n] = 0, {n, 1, 500}]; n = 2; npd = Prime[n]; ct = 1; wt = 1; While[wt < 69, cr = (ct + 1)/2; If[fa[cr] == 0, fa[cr] = n; While[fa[wt] > 0, Print[fa[wt]]; wt = wt + 1]]; n = n + 1; npd = Prime[n]; ct = 1; tt = ct; cp = npd + A019565[tt]; While[ ! (PrimeQ[cp]), ct = ct + 1; tt = ct; cp = npd + A019565[tt]]]
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CROSSREFS
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Cf. A019565, A103790.
Sequence in context: A034919 A134316 A049461 this_sequence A018346 A006398 A053364
Adjacent sequences: A103788 A103789 A103790 this_sequence A103792 A103793 A103794
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KEYWORD
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nonn
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AUTHOR
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Lei Zhou (lzhou5(AT)emory.edu), Feb 16 2005
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