STATUS
editing
proposed
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NAME
Numbers m whose symmetric representation of sigma(m) has at least a part with maximum width 3.
CROSSREFS
Column 3 of A253258.
Twice even perfect numbers. Also a(n) = M(n)*(M(n)+1), where M(n) is the n-th Mersenne prime A000668(n).
(history; published version)
(history; published version)
STATUS
editing
proposed
LINKS
Walter A. Kehowski, <a href="https://www.researchgate.net/publication/383862795_Power-spectral_Numbers">Power-spectral Numbers</a>, ResearchGate (2024); also available at <a href="https://www.vixra.org/pdf/2409.0031v1
STATUS
approved
editing
STATUS
editing
proposed
LINKS
Mathemaesthetics, <a href="https://www.youtube.com/watch?v=-OxLqcGLdqI">2'796'203 Toothpicks, 2'048 Generations</a>, Youtube video (2021).
STATUS
approved
editing
STATUS
editing
proposed
D-toothpick sequence of the second kind (see Comments lines for definition).
(history; published version)
(history; published version)
STATUS
editing
proposed
X-toothpick sequence on Z^3 lattice (see Comments for precise definition).
(history; published version)
(history; published version)
STATUS
editing
proposed