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A068164
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Smallest prime formed from n by inserting appropriate digits in it.
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5
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11, 2, 3, 41, 5, 61, 7, 83, 19, 101, 11, 127, 13, 149, 151, 163, 17, 181, 19, 1201, 211, 223, 23, 241, 251, 263, 127, 281, 29, 307, 31, 1321, 233, 347, 353, 367, 37, 383, 139, 401, 41, 421, 43, 443, 457, 461, 47, 487, 149, 503, 151, 521, 53, 541, 557, 563, 157
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| Smallest prime formed from 20 is 1201, by placing 1 on both sides. Smallest prime formed from 33 is 233, by placing a 2 in front.
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CROSSREFS
| Cf. A018800, A060386. Similar to but different from A062584. E.g. a(133) = 1033, but A062584(133) = 4133.
Sequence in context: A089744 A160137 A107698 * A089754 A110743 A077549
Adjacent sequences: A068161 A068162 A068163 * A068165 A068166 A068167
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KEYWORD
| base,easy,nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Feb 25 2002
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EXTENSIONS
| Corrected by Ray Chandler (rayjchandler(AT)sbcglobal.net), Oct 11 2003
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