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A209876 a(n) = 36*n - 6. 0
30, 66, 102, 138, 174, 210, 246, 282, 318, 354, 390, 426, 462, 498, 534, 570, 606, 642, 678, 714, 750, 786, 822, 858, 894, 930, 966, 1002, 1038, 1074, 1110, 1146, 1182, 1218, 1254, 1290, 1326, 1362, 1398, 1434, 1470, 1506, 1542, 1578, 1614, 1650, 1686, 1722, 1758, 1794, 1830, 1866, 1902, 1938, 1974 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
It appears that the sum of divisors of each term is a multiple of 36. For example, the divisors of a(3)=102 are {1, 2, 3, 6, 17, 34, 51, 102}, with sum 216=6*36.
It also appears that the sum of divisors of each term of {K*n-6} is a multiple of K for K = 72, 144, and 288.
LINKS
FORMULA
G.f.: (6x+30)/(x-1)^2 - Harvey P. Dale, Jun 18 2021
MATHEMATICA
36*Range[60]-6 (* or *) LinearRecurrence[{2, -1}, {30, 66}, 60] (* Harvey P. Dale, Jun 18 2021 *)
CROSSREFS
Cf. A183010.
Sequence in context: A175259 A044132 A044513 * A290145 A157346 A219543
KEYWORD
nonn
AUTHOR
John W. Layman, Mar 14 2012
STATUS
approved

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Last modified July 18 04:06 EDT 2024. Contains 374377 sequences. (Running on oeis4.)