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A028562
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Palindromes of form k*(k+6).
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3
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0, 7, 55, 616, 19591, 76167, 515515, 749947, 7474747, 72999927, 236799997632, 769437734967, 1900289820091, 2998954598992, 5170703070715, 5934592954395, 29175111157192, 51175166157115, 57154688645175, 211106050601112, 570608929806075, 574823545328475
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listen;
history;
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internal format)
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OFFSET
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1,2
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LINKS
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FORMULA
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PROG
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(Python)
from itertools import count, islice
def ispal(n): s = str(n); return s == s[::-1]
def agen():
for k in count(0):
if ispal(k*(k+6)):
yield k*(k+6)
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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