|
|
|
|
34, 84, 34, 84, 34, 194, 34, 84, 34, 84, 34, 228, 34, 84, 34, 84, 34, 194, 34, 84, 34, 84, 34, 228, 34, 84, 34, 84, 34, 194, 34, 84, 34, 84, 34, 386, 34, 84, 34, 84, 34, 194, 34, 84, 34, 84, 34, 228, 34, 84, 34, 84, 34, 194, 34, 84, 34, 84, 34, 228, 34, 84, 34, 84, 34, 194
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
LINKS
|
|
|
FORMULA
|
a(n) = Min{x : sigma_4n(x) mod x = 0, x > 1}
|
|
EXAMPLE
|
First 3 terms correspond to entries of other sequences as follows: a(1)=A046763(2), a(2)=A055712(2), a(3)=A055716(2).
First position of values, with observations pertaining to values for 1 <= n <= 3000:
Value Position Observations:
--------------------------------
34 1 All odd.
228 12
386 36
1282 72
1538 144
3084 288
147468 576
1956 864
1046532 1152
24578 2304
3252 2880
(End)
|
|
MATHEMATICA
|
Table[m = 2; While[Mod[DivisorSigma[4 n, m], m] > 0, m++]; m, {n, 66}] (* Michael De Vlieger, Jul 17 2017 *)
|
|
PROG
|
(PARI) a(n) = {n *= 4; my(m = 2); while (sigma(m, n) % m, m++); m; } \\ Michel Marcus, Oct 02 2016
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|