0,1

Zeros appear for n which are a member of A068191.

If the requirement "positive" is dropped, a(0) becomes 0 instead.

Table of n, a(n) for n=0..75.

a(21)=371 because 371 is the smallest nonprime positive number whose digital product is 21 (3*7*1 = 21).

Cf. A107698 (smallest primes with digital product n)

Sequence in context: A070606 A073731 A179937 * A099613 A209924 A209926

Adjacent sequences: A198484 A198485 A198486 * A198488 A198489 A198490

nonn,base

Jaroslav Krizek, Oct 25 2011

approved