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A073170
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a(1) = a(2) = 1; for n>2, a(n) = prime(n-1)-n+1.
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0
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0, 0, 1, 2, 3, 6, 7, 10, 11, 14, 19, 20, 25, 28, 29, 32, 37, 42, 43, 48, 51, 52, 57, 60, 65, 72, 75, 76, 79, 80, 83, 96, 99, 104, 105, 114, 115, 120, 125, 128, 133, 138, 139, 148, 149, 152, 153, 164, 175, 178, 179, 182, 187, 188, 197, 202, 207, 212, 213, 218, 221
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,4
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COMMENTS
| Smallest x such that A002808(x)-x (cf. A073169) equals n, or 0 if no such value exists.
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FORMULA
| a(n)=Min{x; composite[x]-x=n}
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MATHEMATICA
| f[x_] := FixedPoint[x+PrimePi[ # ]+1&, x] t=Table[0, {100}]; Do[s=f[n]-n; If[s<101&&t[[s]]==0, t[[s]]=n], {n, 1, 10000}]; t
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CROSSREFS
| Cf. A002808, A073168, A073169. Essentially same sequence as A014689.
Cf. A000040, A014689.
Sequence in context: A042964 A062837 A190670 * A014689 A117206 A026443
Adjacent sequences: A073167 A073168 A073169 * A073171 A073172 A073173
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KEYWORD
| nonn
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AUTHOR
| Labos E. (labos(AT)ana.sote.hu), Jul 19 2002
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EXTENSIONS
| Simpler description from Vladeta Jovovic (vladeta(AT)eunet.rs), Mar 29 2003
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