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Search: id:A085414
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| A085414 |
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Primes that are a concatenation of a prime and its first digit. |
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+0
3
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| 131, 191, 313, 373, 797, 1031, 1091, 1511, 1571, 1811, 1931, 3313, 3373, 3533, 3593, 3673, 3733, 3793, 3833, 7517, 7577, 7877, 9199, 9419, 9479, 9539, 9679, 9719, 9839, 10091, 10211, 10331, 10391, 10631, 10691, 11171, 12011, 12491, 12791, 12911
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Also primes remaining prime after deleting last digit, but not all such primes. See also A012833, A024770, A033664, A069867.
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EXAMPLE
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13 is a term because concatenation of 13 and 1 is prime
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CROSSREFS
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Cf. A085412, A085413, A012833, A024770, A033664, A069867.
Sequence in context: A140623 A050261 A032750 this_sequence A068686 A082807 A088288
Adjacent sequences: A085411 A085412 A085413 this_sequence A085415 A085416 A085417
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KEYWORD
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nonn,base
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Jun 29 2003
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