OFFSET
1,2
LINKS
Shyam Sunder Gupta, Table of n, a(n) for n = 1..5000
EXAMPLE
1, 2, 3 is the smallest set of 3 consecutive deficient numbers in arithmetic progression so 1 is in the list.
MATHEMATICA
DefQ[n_] := DivisorSigma[1, n] < 2 n; m = 2; z1 = 2; cd = 1; a = {}; Do[If[DefQ[n], If[n - z1 == cd, m = m + 1; If[m > 2, AppendTo[a, n - 2*cd]], m = 2; cd = n - z1]; z1 = n], {n, 3, 1000000}]; a
CROSSREFS
KEYWORD
nonn
AUTHOR
Shyam Sunder Gupta, Nov 11 2013
STATUS
approved