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A062371 Numbers the product of whose nonzero digits is a perfect square. 2
1, 4, 9, 10, 11, 14, 19, 22, 28, 33, 40, 41, 44, 49, 55, 66, 77, 82, 88, 90, 91, 94, 99, 100, 101, 104, 109, 110, 111, 114, 119, 122, 128, 133, 140, 141, 144, 149, 155, 166, 177, 182, 188, 190, 191, 194, 199, 202, 208, 212, 218, 220, 221, 224, 229, 236, 242, 248 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
EXAMPLE
128 is a member as 1*2*8 = 16 is a square. 140 is also a member as 1*4 = 4.
PROG
(PARI) ProdNzD(x)= { p=1; while (x>9, d=x-10*(x\10); if (d, p*=d); x\=10); return(p*x) } { n=-1; for (m=1, 10^9, if (issquare(ProdNzD(m)), write("b062371.txt", n++, " ", m); if (n==1000, break)) ) } \\ Harry J. Smith, Aug 06 2009
CROSSREFS
Sequence in context: A166498 A266297 A174800 * A046030 A125726 A352323
KEYWORD
nonn,base,easy
AUTHOR
Amarnath Murthy, Jun 26 2001
EXTENSIONS
Corrected and extended by Larry Reeves (larryr(AT)acm.org), Jul 06 2001
STATUS
approved

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Last modified March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)