A257120 - OEIS

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A257120

Position of first occurrence of n in A256918.

5

1, 4, 3, 5, 7, 11, 29, 13, 10, 15, 122, 19, 200, 31, 24, 18, 299, 22, 824, 16, 33, 124, 945, 41, 26, 202, 21, 37, 3093, 45, 7059, 40, 126, 301, 53, 66, 13527, 826, 204, 42, 28658, 36, 40810, 130, 57, 947, 46657, 64, 80, 44, 303, 208, 57449, 49, 133, 38, 828

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OFFSET

1,2

COMMENTS

A256918(a(n)) = n and A256918(m) != n for m < a(n);

GCD(A257218(a(n)),A257218(a(n)+1)) = n;

if A257218 is a permutation, then also this sequence is a permutation;

a(n) < A257475(n); a(n) = A257475(n) - A257478(n).

a(n) >= A257122(n)-1. - Ivan Neretin, May 02 2015

LINKS

Hiroaki Yamanouchi, Table of n, a(n) for n = 1..72

EXAMPLE

PROG

(Haskell)

import Data.List (elemIndex); import Data.Maybe (fromJust)

a257120 = (+ 1) . fromJust . (`elemIndex` a256918_list)

CROSSREFS

Cf. A256918, A257475, A257478, A257218.

Sequence in context: A317530 A171021 A035427 * A306835 A033546 A236360

Adjacent sequences: A257117 A257118 A257119 * A257121 A257122 A257123

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Apr 25 2015

EXTENSIONS

a(41)-a(57) from Hiroaki Yamanouchi, May 03 2015

STATUS

approved