A070016 - OEIS

A070016

Least m such that Chowla's function value of m [A048050(m)] equals n or 0 if no such number exists.

0, 4, 9, 0, 6, 8, 10, 15, 14, 21, 121, 27, 22, 16, 12, 39, 289, 65, 34, 18, 20, 57, 529, 95, 46, 69, 28, 115, 841, 32, 58, 45, 62, 93, 24, 155, 1369, 217, 44, 63, 30, 50, 82, 123, 52, 129, 2209, 75, 40, 141, 0, 235, 42, 36, 106, 99, 68, 265, 3481, 371, 118, 64, 56, 117

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

Remark that A070016(n)=A070015(n+1) in accordance with A048995(k)+1=A005114(k).

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000

FORMULA

a(n)=Min{x; A048050(x)=n} or a(n)=0 if n is from A048995.

EXAMPLE

n=127: a(n)=16129, divisors={1,127,16129}, 127=sigma[n]-n-1=127 and 16129 is the smallest.

MATHEMATICA