|
Search: id:A063119
|
|
|
| A063119 |
|
a(n) = sigma(a(n-1)) + phi(a(n-1)), a(1)=3. |
|
+0
1
|
|
| 3, 6, 14, 30, 80, 218, 438, 1032, 2976, 9024, 27328, 74512, 181646, 363294, 908268, 2422072, 5752432, 15203056, 39044504, 92788840, 252556992, 808096140, 2666717760, 10285934208, 33734451200, 97757260032, 293143652800
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
LINKS
|
Harry J. Smith, Table of n, a(n) for n=1,...,140
|
|
PROGRAM
|
(PARI) a(n)=if(n<2, n+2, sigma(a(n-1))+eulerphi(a(n-1))); for(n=1, 22, print(a(n)))
(PARI) { for (n=1, 140, if (n>1, a=sigma(a) + eulerphi(a), a=3); write("b063119.txt", n, " ", a) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Aug 19 2009]
|
|
CROSSREFS
|
Sequence in context: A131244 A077926 A091601 this_sequence A106803 A006356 A077998
Adjacent sequences: A063116 A063117 A063118 this_sequence A063120 A063121 A063122
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Jason Earls (zevi_35711(AT)yahoo.com), Aug 09 2001
|
|
EXTENSIONS
|
More terms from Harry J. Smith (hjsmithh(AT)sbcglobal.net), Aug 19 2009
|
|
|
Search completed in 0.002 seconds
|
