A108546 - OEIS

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A108546

Lexicographically smallest permutation of primes such that for n>1 forms 4*k+1 and 4*k+3 alternate.

2, 3, 5, 7, 13, 11, 17, 19, 29, 23, 37, 31, 41, 43, 53, 47, 61, 59, 73, 67, 89, 71, 97, 79, 101, 83, 109, 103, 113, 107, 137, 127, 149, 131, 157, 139, 173, 151, 181, 163, 193, 167, 197, 179, 229, 191, 233, 199, 241, 211, 257, 223, 269, 227, 277, 239, 281, 251, 293 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`a(n) mod 4 = 3 - 2 * (n mod 2) for n>1.` `For n > 1: a(n) = A111745(n-1);` `a(2n+1) - a(2n) = A102261(n).`
	PROG	`(Haskell)` `a108546 n = a108546_list !! (n-1)` `a108546_list = 2 : interleave a002145_list a002144_list` `where interleave (x:xs) ys = x : interleave ys xs` `-- Reinhard Zumkeller, Feb 22 2011`
	CROSSREFS	`Cf. A002144, A002145.` `Sequence in context: A126055 A126054 A067836 * A065107 A185956 A168484` `Adjacent sequences: A108543 A108544 A108545 * A108547 A108548 A108549`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jun 10 2005`

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Last modified February 16 14:37 EST 2012. Contains 205930 sequences.