|
Search: id:A122213
|
|
|
| A122213 |
|
a(n) = (sum of the divisors of n)th integer from among those positive integers which are coprime to n. |
|
+0
2
|
|
| 1, 5, 5, 13, 7, 35, 9, 29, 19, 43, 13, 83, 15, 55, 44, 61, 19, 115, 21, 103, 55, 79, 25, 179, 38, 89, 59, 129, 31, 269, 33, 125, 79, 113, 69, 271, 39, 125, 89, 223, 43, 335, 45, 183, 146, 149, 49, 371, 66, 231, 113, 211, 55, 359, 98, 279, 125, 185, 61, 629, 63, 197, 181
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
LINKS
|
Leroy Quet, Home Page (listed in lieu of email address)
|
|
EXAMPLE
|
8 = 1 + 7 is the sum of the divisors of 7. 1,2,3,4,5,6,8,9,10,11,12,13,15,16,... are the positive integers
which are coprime to 7. Of these integers, 9 is the 8th. So a(7) = 9.
|
|
MATHEMATICA
|
f[n_] := Block[{c = DivisorSigma[1, n], k = 0}, While[c > 0, k++; While[GCD[n, k] > 1, k++ ]; c-- ]; k ]; Table[f[n], {n, 63}] (*Chandler*)
|
|
CROSSREFS
|
Cf. A122212.
Adjacent sequences: A122210 A122211 A122212 this_sequence A122214 A122215 A122216
Sequence in context: A098331 A061391 A123133 this_sequence A049735 A055526 A146984
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Leroy Quet Aug 26 2006
|
|
EXTENSIONS
|
Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Aug 29 2006
|
|
|
Search completed in 0.002 seconds
|
