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A084737
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Beginning with 1, numbers such that {a(n+2)-a(n+1)}/{a(n+1)-a(n)} =prime(n).
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0
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1, 2, 4, 10, 40, 250, 2560, 32590, 543100, 10242790, 233335660, 6703028890, 207263519020, 7628001653830, 311878265181040, 13394639596851070, 628284422185342480, 33217442899375387210, 1955977793053588026280
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Successive differences are primorials.
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EXAMPLE
| a(3) = 4, a(4) = 10 and a(5)= 40 and (40-10}/(10-4) = 5 = prime(3).
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MATHEMATICA
| Join[{1}, Accumulate[FoldList[Times, 1, Prime[Range[20]]]]+1] (* From Harvey P. Dale, Dec 14 2011 *)
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CROSSREFS
| Sequence in context: A193675 A111022 A086852 * A153757 A159860 A013549
Adjacent sequences: A084734 A084735 A084736 * A084738 A084739 A084740
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KEYWORD
| nonn
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AUTHOR
| Amarnath Murthy and Meenakshi Srikanth (amarnath_murthy(AT)yahoo.com), Jun 14 2003
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EXTENSIONS
| More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Jun 17 2003
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