

A291373


a(n) is the smallest number k such that A001065(k) = A002110(n), or 0 if no such k exists.


0




OFFSET

0,1


COMMENTS

a(10) = 4057230930.  Giovanni Resta, Aug 23 2017


LINKS

Table of n, a(n) for n=0..7.


FORMULA

a(n) = A070015(A002110(n)).  Michel Marcus, Aug 25 2017


EXAMPLE

a(5) = 1722 because sigma(1722)  1722 = 2*3*5*7*11 = A002110(5) and 1722 is the least number with this property.


CROSSREFS

Cf. A001065, A002110, A070015, A153076, A291356.
Sequence in context: A305620 A294470 A283654 * A021487 A197391 A285174
Adjacent sequences: A291370 A291371 A291372 * A291374 A291375 A291376


KEYWORD

nonn,hard,more


AUTHOR

Altug Alkan, Aug 23 2017


EXTENSIONS

a(7) confirmed by Giovanni Resta, Aug 23 2017


STATUS

approved



