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A074067 Zigzag modulo 5. 2
1, 2, 7, 6, 5, 4, 3, 12, 11, 10, 9, 8, 17, 16, 15, 14, 13, 22, 21, 20, 19, 18, 27, 26, 25, 24, 23, 32, 31, 30, 29, 28, 37, 36, 35, 34, 33, 42, 41, 40, 39, 38, 47, 46, 45, 44, 43, 52, 51, 50, 49, 48, 57, 56, 55, 54, 53, 62, 61, 60, 59, 58, 67, 66, 65, 64, 63, 72, 71 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

COMMENTS

a(a(n))=n (a self-inverse permutation);

for n>1: a(n) = n iff n == 0 modulo 5.

LINKS

Eric Weisstein's World of Mathematics, Alternating Permutations

Reinhard Zumkeller, Illustration for A074066-A074068

Index entries for sequences that are permutations of the natural numbers

FORMULA

a(n) = 5*floor(n/5) + 10*floor((n mod 5)/3) - (n mod 5) for n>2; a(n)=n for n<=2.

CROSSREFS

Cf. A074066, A074068.

Sequence in context: A135155 A175477 A011263 * A110988 A047224 A127817

Adjacent sequences:  A074064 A074065 A074066 * A074068 A074069 A074070

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Aug 17 2002

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Last modified February 16 11:30 EST 2012. Contains 205907 sequences.