OFFSET
1,1
LINKS
Harry J. Smith, Table of n, a(n) for n = 1..1000
MATHEMATICA
f[x_] := Prime[x + 1] - Prime[x]; Select[Range[3, 10^3], f[ # ] == f[ # - 1] - f[ # - 2] &]
Flatten[Position[Partition[Differences[Prime[Range[500]]], 3, 1], _?(#[[3]] == #[[2]]-#[[1]]&), 1, Heads->False]]+2 (* Harvey P. Dale, Mar 19 2019 *)
PROG
(PARI) Gap(m) = { return(prime(m+1) - prime(m)); }
{ n=0; for (m=3, 10^10, if (Gap(m) == Gap(m-1) - Gap(m-2), write("b066513.txt", n++, " ", m); if (n==1000, return)) ) } \\ Harry J. Smith, Feb 20 2010
CROSSREFS
KEYWORD
nonn
AUTHOR
Joseph L. Pe, Jan 04 2002
STATUS
approved