A387640 A387523(n) is the a(n)-th prime number.

1, 2, 3, 4, 6, 5, 7, 8, 9, 10, 11, 14, 13, 12, 15, 19, 18, 17, 16, 21, 20, 23, 22, 30, 29, 28, 27, 26, 25, 24, 31, 37, 36, 35, 34, 33, 32, 44, 43, 42, 41, 40, 39, 38, 46, 45, 47, 54, 53, 52, 51, 50, 49, 48, 65, 64, 63, 62, 61, 60, 59, 58, 57, 56, 55, 68, 67

Offset

1,2

Comments

If the conjecture in A387523 is true, then the present sequence is self-inverse.

Links

Rémy Sigrist, Table of n, a(n) for n = 1..10949

Rémy Sigrist, PARI program

Formula

a(n) = A000720(A387523(n)).

Example

a(42) = A000720(A387523(42)) = A000720(173) = 40.

Prog

(PARI) \\ See Links section.

Crossrefs

Cf. A000720, A386482, A387523, A387544.

Sequence in context: A227788 A222245 A275582 * A129607 A130340 A130339

Adjacent sequences: A387637 A387638 A387639 * A387641 A387642 A387643

Keyword

nonn

Author

Rémy Sigrist, Sep 04 2025

Status

approved