|
| |
|
|
A066307
|
|
Nonprimes such that sum of digits equals product of digits.
|
|
4
| |
|
|
1, 4, 6, 8, 9, 22, 123, 132, 213, 231, 312, 321, 1124, 1142, 1214, 1241, 1412, 1421, 2114, 4112, 4121, 11125, 11133, 11152, 11215, 11222, 11313, 11331, 11512, 11521, 12115, 12122, 12151, 12212, 12221, 13113, 13131, 13311, 15112, 15211, 21115
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,2
|
|
|
LINKS
| Harry J. Smith, Table of n, a(n) for n=1,...,516
|
|
|
EXAMPLE
| 321=3.107, 3+2+1=6=3.2.1
|
|
|
PROG
| (PARI) SumD(x)= { local(s=0); while (x>9, s+=x%10; x\=10); return(s + x) } ProdD(x)= { local(p=1); while (x>9 && p>0, p*=x%10; x\=10); return(p*x) } { n=0; for (m=1, 10^9, if (isprime(m), next); if (SumD(m)==ProdD(m), write("b066307.txt", n++, " ", m); if (n==1000, return)) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Feb 09 2010]
|
|
|
CROSSREFS
| Composites and 1 from A034710.
Cf. A034710, A066306.
Sequence in context: A078337 A046351 A161732 * A099071 A156673 A073866
Adjacent sequences: A066304 A066305 A066306 * A066308 A066309 A066310
|
|
|
KEYWORD
| base,nonn
|
|
|
AUTHOR
| Labos E. (labos(AT)ana.sote.hu), Dec 13 2001
|
| |
|
|
