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A085414 Primes that are a concatenation of a prime and its first digit. 2
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; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Also primes remaining prime after deleting last digit, but not all such primes. See also A012833, A024770, A033664, A069867.
LINKS
EXAMPLE
13 is a term because concatenation of 13 and 1 is prime.
CROSSREFS
Sequence in context: A180544 A032750 A270596 * A068686 A082807 A088288
KEYWORD
nonn,base
AUTHOR
_Zak Seidov_, Jun 29 2003
STATUS
approved

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Last modified February 22 11:38 EST 2024. Contains 370255 sequences. (Running on oeis4.)