id:A048986 - OEIS Search Results

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Home primes in base 2: primes reached when you start with n and (working in base 2) concatenate its prime factors (A048985); repeat until a prime is reached (or -1 if no prime is ever reached). Answer is written in base 10.

+0
6

1, 2, 3, 31, 5, 11, 7, 179, 29, 31, 11, 43, 13, 23, 29, 12007, 17, 47, 19, 251, 31, 43, 23, 499, 4091, 4091, 127, 4091, 29, 127, 31, 1564237, 59, 4079, 47, 367, 37, 83, 61, 383, 41, 179, 43, 499, 4091, 4091, 47, 683, 127, 173, 113, 173, 53, 191, 4091 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`a(1) = 1 by convention.`
	LINKS	`P. De Geest, Home Primes`
	EXAMPLE	`4 = 22 -> 1010 = 10 = 25 ->10101 = 21 = 3*7 -> 11111 = 31 = prime.`
	CROSSREFS	`Cf. A048985, A037274, A049065.` `Sequence in context: A137981 A110351 A088115 this_sequence A093712 A035514 A114009` `Adjacent sequences: A048983 A048984 A048985 this_sequence A048987 A048988 A048989`
	KEYWORD	`nonn,base,nice`
	AUTHOR	`Michael B Greenwald (mbgreen(AT)central.cis.upenn.edu)`

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Last modified December 8 08:17 EST 2009. Contains 170430 sequences.

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