A030058 Least non-sum of divisors of n for some n >= 1.

2, 4, 8, 13, 16, 29, 32, 40, 43, 57, 61, 64, 73, 91, 92, 97, 121, 125, 128, 145, 169, 181, 187, 196, 211, 218, 225, 235, 249, 253, 256, 281, 313, 337, 361, 364, 373, 379, 393, 400, 404, 435, 466, 469, 481, 505, 509, 512, 547, 559, 561, 577, 589

Offset: 1

Author

David W. Wilson

Keywords

• nonn
• nice

Comments

Values appearing in A030057. - T. D. Noe, Apr 03 2014

Crossrefs

Cf. A030057.

Programs

Mathematica

nmax = 100; terms = 53; notSum[n_] := notSum[n] = First[Complement[Range[ DivisorSigma[1, n] + 1], Total /@ Subsets[Divisors[n]]]]; seq0 = {}; While[u = Union[Table[notSum[n], {n, 1, nmax}]]; seq = Take[u, Min[terms, Length[u]]]; seq != seq0, seq0 = seq; Print[nmax]; nmax = nmax + 50]; A030058 = seq (* Jean-François Alcover, Oct 10 2016 *)