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A067779
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Primes such that the sum of the squares of its digits is equal to the product of its digits.
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0
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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; internal format)
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OFFSET
| 1,1
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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
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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, ", ")))
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CROSSREFS
| Sequence in context: A178589 A179917 A067791 * A202377 A185768 A082440
Adjacent sequences: A067776 A067777 A067778 * A067780 A067781 A067782
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KEYWORD
| easy,nonn,base
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AUTHOR
| Felice Russo (frusso(AT)micron.com), Feb 06 2002
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EXTENSIONS
| Edited and extended by Klaus Brockhaus (klaus-brockhaus(AT)t-online.de) Feb 11 2002
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