|
Search: id:A039670
|
|
|
| A039670 |
|
Sets of 4 numbers in arithmetical progression with common difference 6 and whose phi values are equal. |
|
+0
2
|
|
| 72, 78, 84, 90, 216, 222, 228, 234, 76326, 76332, 76338, 76344, 101526, 101532, 101538, 101544, 116646, 116652, 116658, 116664, 146886, 146892, 146898, 146904, 298086, 298092, 298098, 298104, 369366, 369372, 369378, 369384, 624966, 624972
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
This is really four sequences, not one! A050498 is a better version. - N. J. A. Sloane (njas(AT)research.att.com), Jan 01 2005
|
|
REFERENCES
|
D. Wells, Curious and interesting numbers, Penguin Books, p. 112 (but beware errors).
|
|
MAPLE
|
with(numtheory):for n from 1 to 1000000 do if(phi(n)=phi(n+6) and phi(n+6)=phi(n+12) and phi(n+12)=phi(n+18)) then printf("%d, %d, %d, %d, ", n, n+6, n+12, n+18) fi od: (Ronaldo)
|
|
CROSSREFS
|
Sequence in context: A003898 A133899 A138691 this_sequence A065147 A043187 A039364
Adjacent sequences: A039667 A039668 A039669 this_sequence A039671 A039672 A039673
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Felice Russo (felice.russo(AT)katamail.com)
|
|
EXTENSIONS
|
Corrected by Jud McCranie (j.mccranie(AT)comcast.net), Dec 26 1999.
More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Dec 29 2004
|
|
|
Search completed in 0.002 seconds
|
