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A086558
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Smallest n-digit number beginning with n and having prime signature of n, or 0 if no such number exists.
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1
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1, 23, 307, 4489, 50021, 600007, 7000003, 80062991, 900660121, 1000000006, 11000000021, 120000000004, 1300000000021, 14000000000001, 150000000000017, 1604502443050081, 17000000000000009, 180000000000000027
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Conjecture: no term is zero.
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EXAMPLE
| a(4) = 4489 = 67^2, 4= 2^2. a(12) = 120000000004= 2^2*30000000001, prime signature: p^2*q.
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CROSSREFS
| Sequence in context: A023021 A022651 A077504 * A090927 A045530 A080188
Adjacent sequences: A086555 A086556 A086557 * A086559 A086560 A086561
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KEYWORD
| base,nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Aug 30 2003
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EXTENSIONS
| Corrected and extended by Sascha Kurz (sascha.kurz(AT)uni-bayreuth.de), Sep 22 2003
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