A066250 - OEIS

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A066250

a(n) = if n+1 is prime then A049084(n+1)*2 - 1 else A066246(n+1)*2.

1, 3, 2, 5, 4, 7, 6, 8, 10, 9, 12, 11, 14, 16, 18, 13, 20, 15, 22, 24, 26, 17, 28, 30, 32, 34, 36, 19, 38, 21, 40, 42, 44, 46, 48, 23, 50, 52, 54, 25, 56, 27, 58, 60, 62, 29, 64, 66, 68, 70, 72, 31, 74, 76, 78, 80, 82, 33, 84, 35, 86, 88, 90, 92, 94, 37, 96, 98, 100, 39, 102

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OFFSET

1,2

COMMENTS

Permutation of natural numbers; inverse: A066251.

LINKS

Table of n, a(n) for n=1..71.

Index entries for sequences that are permutations of the natural numbers

FORMULA

a(n) = A026238(n+1)*2 - A010051(n+1).

CROSSREFS

Cf. A066251, A049084, A066246, A026238, A010051, A066248, A066254.