This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A198487 Smallest nonprime positive numbers whose digital product = n, or 0 if impossible. 4
 10, 1, 12, 1113, 4, 15, 6, 117, 8, 9, 25, 0, 26, 0, 27, 35, 28, 0, 36, 0, 45, 371, 0, 0, 38, 55, 0, 39, 74, 0, 56, 0, 48, 0, 0, 57, 49, 0, 0, 0, 58, 0, 76, 0, 0, 95, 0, 0, 68, 77, 255, 0, 0, 0, 69, 0, 78, 0, 0, 0, 256, 0, 0, 791, 88, 0, 0, 0, 0, 0, 275, 0, 98, 0, 0, 355 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS Zeros appear for n which are a member of A068191. If the requirement "positive" is dropped, a(0) becomes 0 instead. LINKS EXAMPLE a(21)=371 because 371 is  the smallest nonprime positive number whose digital product is 21 (3*7*1 = 21). CROSSREFS 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 KEYWORD nonn,base AUTHOR Jaroslav Krizek, Oct 25 2011 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified May 22 18:53 EDT 2019. Contains 323481 sequences. (Running on oeis4.)