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A363829
Sum of the divisors of A000129(n) (Pell numbers).
5
1, 3, 6, 28, 30, 144, 183, 1080, 1188, 3780, 5742, 52416, 33462, 131760, 251100, 1290096, 1145124, 5702400, 6804204, 42336000, 50176404, 146352096, 226041700, 2333111040, 1357893000, 4818528000, 9395060400, 47385112320, 44560482150, 251337038400, 264178169640
OFFSET
1,2
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..630 (calculated using Jon E. Schoenfield's a-file at A000129)
FORMULA
a(n) = sigma(Pell(n)) = A000203(A000129(n)).
EXAMPLE
a(9)=1188 because Pell(9)=985 has divisors {1, 5, 197, 985}.
MATHEMATICA
DivisorSigma[1, LinearRecurrence[{2, 1}, {1, 2}, 32]] (* Amiram Eldar, Oct 19 2023 *)
KEYWORD
nonn
AUTHOR
Tyler Busby, Oct 19 2023
STATUS
approved