id:A085412 - OEIS Search Results

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Numbers n such that concatenation of prime[n] and first digit of prime[n] is prime.

+0
3

6, 8, 11, 12, 22, 27, 29, 36, 37, 42, 44, 67, 68, 71, 72, 73, 74, 75, 76, 133, 134, 138, 157, 160, 161, 162, 163, 164, 166, 169, 172, 174, 175, 179, 180, 187, 197, 204, 207, 210, 232, 235, 237, 247, 249, 251, 254, 261, 263, 264, 269, 272, 278, 282, 285, 287, 303 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`6 is a term because prime[6]=13 and concatenation of 13 and 1 is prime`
	CROSSREFS	`Cf. A085413, A085414.` `Sequence in context: A165583 A165473 A145749 this_sequence A120152 A067246 A020716` `Adjacent sequences: A085409 A085410 A085411 this_sequence A085413 A085414 A085415`
	KEYWORD	`nonn,base`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com), Jun 29 2003`

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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.

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