A180463 a(n) is the smallest number m such that sigma(m)=38^n, or 0 if m does not exist.

1, 37, 0, 0, 0, 0, 0, 85811686941, 3175032416817, 159809964979789, 4561513295803851, 155532888827892597, 5754716886632026089, 249887680992407652771, 8319571903089894983277, 307824160414326114381249, 12077787753685017948512649, 455818072892233197941369463

Offset

0,2

Links

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

Example

a(7)=85811686941=3*28603895647 since sigma(85811686941)= (2^2)*(2^5*19^7)=2^7*19^7 and 85811686941 is the smallest such number.

Crossrefs

Cf. A048251, A110077, A180265, A180460, A180461, A180462, A180464.

Sequence in context: A307949 A058432 A058458 * A190301 A077575 A215258

Adjacent sequences: A180460 A180461 A180462 * A180464 A180465 A180466

Keyword

nonn

Author

Walter Kehowski, Sep 06 2010

Extensions

Terms a(16) onward from Max Alekseyev, Mar 03 2014

Status

approved