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A085413 Prime such that concatenation of it and its first digit is prime. +0
3
13, 19, 31, 37, 79, 103, 109, 151, 157, 181, 193, 331, 337, 353, 359, 367, 373, 379, 383, 751, 757, 787, 919, 941, 947, 953, 967, 971, 983, 1009, 1021, 1033, 1039, 1063, 1069, 1117, 1201, 1249, 1279, 1291, 1459, 1483, 1489, 1567, 1579, 1597, 1609, 1663, 1669 (list; graph; listen)
OFFSET

1,1

COMMENT

Indices of primes in A085412; primes as concatenation of prime and its first digit in A085414.

FORMULA

Prime[A085412]

EXAMPLE

13 is a term because concatenation of 13 and 1 is prime

CROSSREFS

Cf. A085412, A085414.

Sequence in context: A040092 A079130 A167473 this_sequence A164333 A069324 A040047

Adjacent sequences: A085410 A085411 A085412 this_sequence A085414 A085415 A085416

KEYWORD

nonn,base

AUTHOR

Zak Seidov (zakseidov(AT)yahoo.com), Jun 29 2003

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Last modified December 11 12:57 EST 2009. Contains 170656 sequences.


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