id:A049201 - OEIS Search Results

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If n is not composite, a(n) = n followed by 1; if n is composite, a(n) = concatenation of prime factors of n.

+0
2

1, 11, 21, 31, 22, 51, 23, 71, 222, 33, 25, 111, 223, 131, 27, 35, 2222, 171, 233, 191, 225, 37, 31, 231, 2223, 55, 33, 333, 227, 291, 235, 311, 22222, 41, 37, 57, 2233, 371, 39, 43, 2225, 411, 237, 431, 231, 335, 43, 471, 22223, 77, 255, 47, 233, 531, 2333, 61 (list; graph; listen)

	OFFSET	`0,2`
	CROSSREFS	`Cf. A049121, A037274.` `Sequence in context: A101223 A109686 A077522 this_sequence A068633 A123849 A108812` `Adjacent sequences: A049198 A049199 A049200 this_sequence A049202 A049203 A049204`
	KEYWORD	`nonn,base,easy`
	AUTHOR	`njas`
	EXTENSIONS	`More terms from Michel ten Voorde (seqfan(AT)tenvoorde.org)`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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