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A020339
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p^2 is least square base n doublet (base n representation is juxtaposition of 2 identical strings)..
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8
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6, 2, 615, 84, 119973, 4, 3, 23620, 36363636364, 6, 24766945690, 17928148, 915, 4, 86808207405692007605, 6, 130, 10, 2667, 95530227420606, 10623969116570, 12, 5, 343872950627253606, 9, 14, 59239353339085, 8130
(list; graph; refs; listen; history; internal format)
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OFFSET
| 2,1
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REFERENCES
| David Wells, "The Penguin Dictionary of Curious and Interesting Numbers", Revised Edition 1997, p. 189.
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LINKS
| A. Ottens, The arithmetic-digits-squares-three.digits problem
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CROSSREFS
| Cf. A020340, A054214, A054215, A054216, A030465, A030466, A030467.
Sequence in context: A038256 A192355 A100251 * A154738 A195738 A184082
Adjacent sequences: A020336 A020337 A020338 * A020340 A020341 A020342
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KEYWORD
| base,nonn
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AUTHOR
| David W. Wilson (davidwwilson(AT)comcast.net)
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