id:A048388 - OEIS Search Results

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Replacing digits d in decimal expansion of n with d^2 yields a prime.

+0
3

11, 13, 17, 19, 21, 27, 51, 57, 71, 73, 81, 87, 89, 91, 101, 103, 107, 119, 123, 129, 131, 133, 137, 149, 153, 161, 167, 169, 173, 189, 191, 197, 199, 201, 203, 207, 213, 223, 229, 231, 233, 249, 253, 267, 283, 307, 311, 313, 319, 321, 331, 337, 341, 359, 371 (list; graph; listen)

	OFFSET	`0,1`
	EXAMPLE	`E.g. 199 = (1)(9)(9) -> (1)(81)(81) = 18181 which is a prime.`
	CROSSREFS	`Cf. A048385, A048389.` `Sequence in context: A055239 A138708 A061116 this_sequence A068191 A084374 A063193` `Adjacent sequences: A048385 A048386 A048387 this_sequence A048389 A048390 A048391`
	KEYWORD	`nonn,base`
	AUTHOR	`Patrick De Geest (pdg(AT)worldofnumbers.com), Mar 15 1999.`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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