|
| |
|
|
A112640
|
|
Odd abundant numbers divisible neither by 5 nor 7.
|
|
6
|
|
|
|
28683369, 36165987, 38660193, 86050107, 108497961, 115980579, 131339637, 138428433, 140397543, 153393669, 160876287, 258150321, 277272567, 296394813, 315517059, 325493883, 347941737, 353761551, 372883797, 373715199, 392006043
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,1
|
|
|
COMMENTS
|
Subsequence of A064001 which itself is a subsequence of A005231. All 500 terms in b-file are divisible by 99. Cf. also A047802. - Zak Seidov, Mar 30 2011
|
|
|
LINKS
|
Amiram Eldar, Table of n, a(n) for n = 1..10000 (terms 1..500 from Zak Seidov)
C. Rivera, Puzzle 329. Odd abundant numbers not divided by 2 or 3.
|
|
|
MATHEMATICA
|
Do[If[Mod[n, 5]>0&&Mod[n, 7]>0&&DivisorSigma[1, n]>2n, Print[n]], {n, 28683369, 6*10^9, 2}] (* Zak Seidov, Mar 30 2011 *)
|
|
|
PROG
|
(PARI) is(n)=gcd(n, 70)==1 && sigma(n, -1)>2 \\ Charles R Greathouse IV, Feb 21 2017
|
|
|
CROSSREFS
|
Cf. A064001, A110585.
Sequence in context: A213914 A345629 A346284 * A200217 A306845 A104828
Adjacent sequences: A112637 A112638 A112639 * A112641 A112642 A112643
|
|
|
KEYWORD
|
nonn
|
|
|
AUTHOR
|
Labos Elemer, Sep 15 2005
|
|
|
EXTENSIONS
|
Extended by Ray Chandler, Sep 19 2005
|
|
|
STATUS
|
approved
|
| |
|
|
