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Search: id:A090119
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| A090119 |
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a(n)=nextprime[A090116(n)], the smallest prime following squares listed in A090116, and also the distance of a(n) from the preceding prime is 2n. |
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5
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| 5, 11, 29, 367, 149, 631, 127, 1949, 541, 907, 3251, 1693, 2503, 10427, 5779, 10831, 10007, 22229, 30631, 25301, 121123, 76207, 93047, 157627, 212557, 35729, 119027, 1121509, 190979, 672439, 693943, 1004027, 259099, 1646101, 675713, 1207841
(list; graph; listen)
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OFFSET
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1,1
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FORMULA
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a(n)=nextprime[A090116(n)^2]=nextprime[A090117(n)]=p[1+pi[A090117(n)]]=A007918[A090116[n]]
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EXAMPLE
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n=7: a(7)=127 because 127-113=14=2.7 and 121=11 is
between {127,113} closest primes to 121 a suitable
square number. Also 127 is the smallest prime with
this property.
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MATHEMATICA
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pre[x_ := Prime[PrimePi[x]] nex[x_ := Prime[PrimePi[x]+1] de[x_ := Prime[PrimePi[x]+1]-Prime[PrimePi[x]] t=Table[de[w^2], {w, 1, 50000}]; mt=Table[Min[Flatten[Position[t, 2*j]]], {j, 1, 100}] Table[nex[Part[mt, j]^2], {j, 1, Length[mt]}]
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CROSSREFS
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Cf. A090116-A090118, A007917, A007918, A000720, A000040, A053001, A007491, A000290.
Adjacent sequences: A090116 A090117 A090118 this_sequence A090120 A090121 A090122
Sequence in context: A001632 A053185 A121534 this_sequence A088484 A114688 A092963
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Jan 09 2004
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