id:A032682 - OEIS Search Results

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Numbers n such that n surrounded by digit '1' is a prime.

+0
12

0, 3, 5, 8, 9, 15, 17, 18, 20, 23, 29, 30, 32, 36, 38, 45, 47, 48, 51, 53, 57, 60, 62, 72, 74, 80, 81, 83, 86, 87, 90, 93, 95, 107, 113, 116, 117, 125, 126, 131, 132, 135, 141, 147, 149, 155, 162, 168, 170, 173, 180, 182, 183, 194, 197, 198, 201, 204, 207, 210 (list; graph; listen)

	OFFSET	`1,2`
	MAPLE	`t0:=[]; u0:=[]; for n from 1 to 100 do t1:=cat(1, n, 1); t1:=convert(t1, decimal, 10); if isprime(t1) then t0:=[op(t0), n]; u0:=[op(u0), t1]; fi; od: t0;`
	CROSSREFS	`The primes are in A099677. Cf. A032686.` `Sequence in context: A137319 A138808 A018804 this_sequence A022769 A067241 A120943` `Adjacent sequences: A032679 A032680 A032681 this_sequence A032683 A032684 A032685`
	KEYWORD	`nonn,base`
	AUTHOR	`Patrick De Geest (pdg(AT)worldofnumbers.com), May 15, 1998.`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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