|
| |
|
|
A090343
|
|
Difference between the sums of the prime factors, including multiplicity, of n and those of n + 4.
|
|
3
|
|
|
|
-5, -3, -4, -2, -1, -2, -4, -1, -7, -2, 3, -1, -4, 1, -11, -1, 7, -5, -4, 0, 0, -2, 14, -2, -19, 5, -22, 1, 15, -9, 19, 0, -23, -2, -4, -1, -4, 9, -27, -4, 30, -13, -4, 4, -3, 13, 27, -6, -39, 1, 4, 4, 31, -20, -43, 1, -39, -2, 46, 0, 43, 17, -54, -9, -8, 2, -4, 9, -47, -25, 58, -11, 55, 21, -66, 10, 6, -25, -4, -1, -10, -2, 51, -3, -67
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,1
|
|
|
LINKS
|
Table of n, a(n) for n=1..85.
|
|
|
FORMULA
|
a(n) = A001414(n) - A001414(n+4). - Wesley Ivan Hurt, Aug 29 2016
|
|
|
EXAMPLE
|
a(24)=-2 because 24=2*2*2*3, 28=2*2*7 and (2+2+2+3)-(2+2+7)=-2.
|
|
|
MATHEMATICA
|
Join[{-5}, #[[1]]-#[[5]]&/@Partition[Table[Total[Times@@@FactorInteger[n]], {n, 2, 90}], 5, 1]] (* Harvey P. Dale, Jul 02 2022 *)
|
|
|
CROSSREFS
|
Cf. A001414, A090340, A090341, A090342.
Sequence in context: A004486 A011426 A293509 * A135448 A243359 A222229
Adjacent sequences: A090340 A090341 A090342 * A090344 A090345 A090346
|
|
|
KEYWORD
|
sign
|
|
|
AUTHOR
|
Charles K. Layman (cklayman(AT)juno.com), Nov 25 2003
|
|
|
STATUS
|
approved
|
| |
|
|
