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 A073170 a(1) = a(2) = 0; for n>2, a(n) = prime(n-1)-n+1. 2
 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; text; internal format)
 OFFSET 1,4 COMMENTS Smallest x such that A002808(x)-x (cf. A073169) equals n, or 0 if no such value exists. LINKS FORMULA a(n)=Min{x; composite[x]-x=n} 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 Join[{0, 0}, Table[Prime[n-1]-n+1, {n, 3, 70}]] (* Harvey P. Dale, Dec 18 2012 *) CROSSREFS Cf. A002808, A073168, A073169. Essentially same sequence as A014689. Cf. A000040, A014689. Sequence in context: A062837 A190670 A226115 * A014689 A117206 A026443 Adjacent sequences:  A073167 A073168 A073169 * A073171 A073172 A073173 KEYWORD nonn AUTHOR Labos Elemer, Jul 19 2002 EXTENSIONS Simpler description from Vladeta Jovovic, Mar 29 2003 Definition corrected by Harvey P. Dale, Dec 18 2012 STATUS approved

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Last modified September 20 10:24 EDT 2020. Contains 337264 sequences. (Running on oeis4.)