|
Search: id:A003624
|
|
|
| A003624 |
|
Duffinian numbers: n composite and relatively prime to sigma (n).
(Formerly M3324)
|
|
+0
2
|
|
| 4, 8, 9, 16, 21, 25, 27, 32, 35, 36, 39, 49, 50, 55, 57, 63, 64, 65, 75, 77, 81, 85, 93, 98, 100, 111, 115, 119, 121, 125, 128, 129, 133, 143, 144, 155, 161, 169, 171, 175, 183, 185, 187, 189, 201, 203, 205, 209, 215, 217, 219, 221, 225, 235, 237, 242, 243, 245, 247
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
REFERENCES
|
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
"The Duffinian Numbers" by L. Richard Duffy, J. Rec. Math., 12 (1979), 112-115.
J. Roberts, Lure of the Integers, Math. Assoc. America, 1992, p. 64.
|
|
LINKS
|
T. D. Noe, Table of n, a(n) for n=1..1000
|
|
CROSSREFS
|
Cf. A014567
Adjacent sequences: A003621 A003622 A003623 this_sequence A003625 A003626 A003627
Sequence in context: A134344 A119315 A010390 this_sequence A100657 A140104 A127398
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
N. J. A. Sloane (njas(AT)research.att.com), Mira Bernstein
|
|
|
Search completed in 0.002 seconds
|
