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A180461 a(n) is the smallest number m such that sigma(m)=26^n, or 0 if m does not exist. 6
1, 0, 0, 0, 312399, 8911029, 187131609, 5560483959, 126501010209, 3186244194273, 85514682943809, 2206011586559697, 55462952723504823, 1577373555132452973, 37744962467192492463, 974816528291192900817, 25345238283868264629273, 658976194648474007782617, 17245346702665551116114601 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,5
LINKS
EXAMPLE
a(4)=312399=3^2*103*337 since sigma(3^2*103*337)=(13)*(2^3*13)*(2*13^2)=2^4*13^4 and 312399 is the smallest such number.
CROSSREFS
Sequence in context: A257015 A237566 A224631 * A250371 A210296 A214244
KEYWORD
nonn
AUTHOR
Walter Kehowski, Sep 06 2010
EXTENSIONS
Terms a(17) onward from Max Alekseyev, Mar 04 2014
STATUS
approved

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Last modified June 24 23:28 EDT 2024. Contains 373691 sequences. (Running on oeis4.)