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A056458 Number of primitive (aperiodic) palindromes using a maximum of two different symbols. 4
2, 0, 2, 2, 6, 4, 14, 12, 28, 24, 62, 54, 126, 112, 246, 240, 510, 476, 1022, 990, 2030, 1984, 4094, 4020, 8184, 8064, 16352, 16254, 32766, 32484, 65534 (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

Table of n, a(n) for n=1..31.

FORMULA

Sum mu(d)*A016116(n/d+1) where d divides n.

CROSSREFS

Column 2 of A284823.

Sequence in context: A071055 A183034 A078052 * A284570 A256847 A046277

Adjacent sequences:  A056455 A056456 A056457 * A056459 A056460 A056461

KEYWORD

nonn

AUTHOR

Marks R. Nester

STATUS

approved

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Last modified November 19 16:10 EST 2017. Contains 294936 sequences.