**A permutation of natural numbers: a(1)=2 a(n) is the smallest integer different from a(1), a(2), a(3), ..., a(n-1) such that a(n)+n is prime.**

*2, 1, 4, 3, 6, 5, 10, 9, 8, 7, 12, 11, 16, 15, 14, 13, 20, 19, 18, 17, 22, 21, 24, 23, 28, 27*

*3 seqfan posts*

Index of A-numbers in seqfan: by ascending order by month by frequency by keyword

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