OFFSET
1,1
COMMENTS
Elements of A119432 that are not divisible by any smaller element of that sequence.
Appears to be the lexicographically latest sequence of squarefree numbers such that all numbers with abundance >= -1 (see A103288) are divisible by one of the terms. - Peter Munn, Oct 19 2020
LINKS
Charles R Greathouse IV, Table of n, a(n) for n = 1..10000
FORMULA
2 followed by odd elements of A119431.
EXAMPLE
From Peter Munn, Oct 23 2020: (Start)
Initial terms, showing factorization:
n a(n)
1 2 = 2
2 105 = 3 * 5 * 7
3 165 = 3 * 5 * 11
4 195 = 3 * 5 * 13
5 3003 = 3 * 7 * 11 * 13
6 3927 = 3 * 7 * 11 * 17
7 4389 = 3 * 7 * 11 * 19
8 4641 = 3 * 7 * 13 * 17
9 4845 = 3 * 5 * 17 * 19
10 5187 = 3 * 7 * 13 * 19
11 5313 = 3 * 7 * 11 * 23
12 5865 = 3 * 5 * 17 * 23
13 6555 = 3 * 5 * 19 * 23
14 7395 = 3 * 5 * 17 * 29
15 7905 = 3 * 5 * 17 * 31
(End)
MATHEMATICA
Block[{a = {}}, Do[If[And[NoneTrue[a, Mod[i, #] == 0 &], 2 EulerPhi[i] <= i], AppendTo[a, i]], {i, 20000}]; a] (* Michael De Vlieger, Nov 05 2020 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Franklin T. Adams-Watters, May 19 2006
STATUS
approved