A180461 a(n) is the smallest number m such that sigma(m)=26^n, or 0 if m does not exist.

1, 0, 0, 0, 312399, 8911029, 187131609, 5560483959, 126501010209, 3186244194273, 85514682943809, 2206011586559697, 55462952723504823, 1577373555132452973, 37744962467192492463, 974816528291192900817, 25345238283868264629273, 658976194648474007782617, 17245346702665551116114601

Offset

0,5

Links

Max Alekseyev, Table of n, a(n) for n = 0..100

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

Cf. A048251, A110077, A180265, A180460, A180462, A180463, A180464.

Sequence in context: A257015 A237566 A224631 * A250371 A210296 A214244

Adjacent sequences: A180458 A180459 A180460 * A180462 A180463 A180464

Keyword

nonn

Author

Walter Kehowski, Sep 06 2010

Extensions

Terms a(17) onward from Max Alekseyev, Mar 04 2014

Status

approved