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A067779 Primes such that the sum of the squares of its digits is equal to the product of its digits. 0
11353, 13513, 15313, 15331, 31153, 31513, 31531, 33151, 35311, 51133, 53113, 1125221, 1212251, 1212521, 1221251, 1252211, 1512221, 2115221, 2122151, 2122511, 2151221, 2152211, 2215211, 2221511, 2251121, 2251211, 5122121 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
An eight-digit term is 11224121, a ten-digit term is 1111111843.
11353 belongs to the sequence because 1^2+1^2+3^2+5^2+3^2=45=1*1*3*5*3
PROG
(PARI) forprime(p=2, 6e6, n=p; sd=0; pd=1; while(n>0, d=divrem(n, 10); n=d[1]; sd=sd+d[2]*d[2]; pd=pd*d[2]); if(sd==pd, print1(p, ", ")))
CROSSREFS
Sequence in context: A179917 A287245 A067791 * A202377 A210122 A364717
KEYWORD
easy,nonn,base
AUTHOR
Felice Russo, Feb 06 2002
EXTENSIONS
Edited and extended by Klaus Brockhaus Feb 11 2002
STATUS
approved

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Last modified July 21 16:10 EDT 2024. Contains 374475 sequences. (Running on oeis4.)