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A011262 In the prime factorization of n, increment odd powers and decrement even powers (multiplicative and self-inverse). 1
1, 4, 9, 2, 25, 36, 49, 16, 3, 100, 121, 18, 169, 196, 225, 8, 289, 12, 361, 50, 441, 484, 529, 144, 5, 676, 81, 98, 841, 900, 961, 64, 1089, 1156, 1225, 6, 1369, 1444, 1521, 400, 1681, 1764, 1849, 242, 75, 2116, 2209, 72, 7, 20, 2601, 338, 2809, 324, 3025, 784, 3249 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

LINKS

Index entries for sequences that are permutations of the natural numbers

FORMULA

Multiplicative with f(p^k) = p^(k-1) if k even, p^(k+1) if k odd.

CROSSREFS

Cf. A011264.

Sequence in context: A007914 A048758 A159253 * A073843 A073842 A136271

Adjacent sequences:  A011259 A011260 A011261 * A011263 A011264 A011265

KEYWORD

nonn,easy,mult

AUTHOR

Marc LeBrun (mlb(AT)well.com)

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Last modified February 14 08:47 EST 2012. Contains 205614 sequences.