A377094 Inverse permutation to A377093.

1, 2, 4, 3, 7, 5, 12, 19, 6, 8, 27, 38, 50, 13, 9, 20, 63, 80, 98, 10, 14, 28, 117, 21, 11, 51, 140, 15, 167, 196, 226, 22, 29, 64, 16, 39, 257, 99, 52, 23, 294, 17, 335, 30, 378, 118, 423, 24, 18, 470, 65, 53, 520, 81, 31, 25, 100, 168, 573, 40, 632, 227, 693

Offset

1,2

Links

Rémy Sigrist, Table of n, a(n) for n = 1..10000

Rémy Sigrist, C++ program

Index entries for sequences that are permutations of the natural numbers

Formula

a(n) <= (n-1)*n/2 + 1. - Michael S. Branicky, Oct 16 2024

Example

A377093(42) = 84, so a(84) = 42.

Prog

(C++) // See Links section.
(Python)
from itertools import count, islice
def agen(): # generator of terms; uses A377093gen() in A377093
    adict, n = dict(), 1
    for k, v in enumerate(A377093gen(), 1):
        if v not in adict:
            adict[v] = k
            while n in adict: yield adict[n]; n += 1
print(list(islice(agen(), 63))) # Michael S. Branicky, Oct 16 2024

Crossrefs

Cf. A377093.

Sequence in context: A258237 A361939 A371237 * A108228 A127008 A199535

Adjacent sequences: A377091 A377092 A377093 * A377095 A377096 A377097

Keyword

nonn

Author

Rémy Sigrist, Oct 16 2024

Status

approved