|
| |
|
|
A137179
|
|
a(n) = the smallest positive integer m such that d(m) + d(m+1) = n, where d(m) is the number of positive divisors of m. (a(n) is the smallest m where A092405(m) = n.).
|
|
0
|
|
|
|
1, 2, 3, 5, 8, 11, 15, 20, 24, 39, 35, 59, 80, 84, 195, 167, 120, 119, 224, 239, 399, 335, 440, 359, 360, 480, 1520, 539, 899, 719, 1224, 720, 840, 1079, 3135, 1259, 5183, 1260, 2400, 2160, 1680, 1679, 9408, 2880, 7056, 2639, 3024, 2520, 6240, 2519, 7055, 6929
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
3,2
|
|
|
LINKS
|
Table of n, a(n) for n=3..54.
|
|
|
MATHEMATICA
|
a = {}; For[n = 3, n < 60, n++, i = 1; While[ ! DivisorSigma[0, i] + DivisorSigma[0, i + 1] == n, i++ ]; AppendTo[a, i]]; a - Stefan Steinerberger, May 18 2008
|
|
|
CROSSREFS
|
Cf. A092405.
Sequence in context: A131073 A062485 A175143 * A096777 A125811 A071424
Adjacent sequences: A137176 A137177 A137178 * A137180 A137181 A137182
|
|
|
KEYWORD
|
nonn
|
|
|
AUTHOR
|
Leroy Quet May 11 2008
|
|
|
EXTENSIONS
|
More terms from Stefan Steinerberger, May 18 2008
|
|
|
STATUS
|
approved
|
| |
|
|
