|
|
A056461
|
|
Number of primitive (aperiodic) palindromes using a maximum of five different symbols.
|
|
4
|
|
|
5, 0, 20, 20, 120, 100, 620, 600, 3100, 3000, 15620, 15480, 78120, 77500, 390480, 390000, 1953120, 1949900, 9765620, 9762480, 48827480, 48812500, 244140620, 244124400, 1220703000, 1220625000, 6103512500, 6103437480, 30517578120, 30517184400, 152587890620, 152587500000
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
REFERENCES
|
M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia. [See A056391 for pdf file of Chap. 2]
|
|
LINKS
|
|
|
FORMULA
|
|
|
PROG
|
(PARI) a(n) = sumdiv(n, d, moebius(d)*5^((1 + n/d)\2));
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|