A377915 a(n) = m means A342042(n) is the m-th term of A377912.

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 28, 14, 15, 43, 16, 17, 56, 18, 19, 67, 20, 21, 22, 44, 23, 24, 57, 25, 26, 68, 27, 29, 30, 31, 32, 45, 33, 34, 58, 35, 36, 69, 37, 38, 39, 59, 40, 41, 70, 42, 46, 47, 48, 49, 60, 50, 51, 71, 52, 53, 54, 72, 55, 61, 62, 63, 64, 73, 65, 66, 74, 75, 76, 77, 78, 201, 79, 80, 310, 81, 82, 406, 83, 84, 491, 85, 86, 87, 88, 202, 203

Offset

1,2

Comments

That is, a(n) = m means A342042(n) = A377912(m).

The reason for looking at this is that A342042 is a permutation of A377912. But not all nonnegative integers appear in either sequence. The present sequence shows the numbers in A342042 in the order in which they appear in A377912. It is a permutation of the natural numbers. A377916 gives the inverse permutation.

Links

Rémy Sigrist, Table of n, a(n) for n = 1..20000

Rémy Sigrist, PARI program

Index entries for sequences that are permutations of the natural numbers

Example

A342042(14) = 30 is the 28-th term of A377912, so a(14) = 38.

Prog

(PARI) \\ See Links section.

Crossrefs

Cf. A342042, A377912, A377916.

Sequence in context: A023767 A023794 A032948 * A132031 A323175 A323204

Adjacent sequences: A377912 A377913 A377914 * A377916 A377917 A377918

Keyword

nonn,base,new

Author

N. J. A. Sloane, Nov 29 2024

Status

approved