|
| |
|
|
A039670
|
|
Sets of 4 numbers in arithmetic progression with common difference 6 and whose phi values are equal.
|
|
1
| |
|
|
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; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
COMMENTS
| 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: A133899 A181466 A138691 * A065147 A043187 A039364
Adjacent sequences: A039667 A039668 A039669 * A039671 A039672 A039673
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Felice Russo (frusso(AT)micron.com)
|
|
|
EXTENSIONS
| Corrected by Jud McCranie (JudMcCranie(AT)ugaalum.uga.edu), Dec 26 1999.
More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Dec 29 2004
|
| |
|
|
