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A354931 a(n) = the least k for which A345992(k) = n. 4
1, 6, 12, 20, 15, 42, 28, 24, 45, 110, 33, 156, 91, 70, 60, 112, 51, 342, 76, 140, 231, 198, 69, 168, 325, 234, 108, 476, 87, 930, 124, 96, 561, 170, 315, 1116, 185, 418, 195, 360, 123, 714, 172, 220, 585, 1426, 141, 336, 245, 850, 204, 988, 159, 270, 385, 1064, 1311, 522, 177, 3660, 488, 434, 504, 320, 715, 1254 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
Antti Karttunen, Table of n, a(n) for n = 1..3349 (computed using million term data file provided for A344005 by N. J. A. Sloane)
FORMULA
a(n) = n * A354932(n).
MATHEMATICA
s[n_] := Module[{m = 1}, While[!Divisible[m*(m+1), n], m++]; GCD[n, m]]; a[n_] := Module[{k = n}, While[s[k] != n, k+=n]; k]; Array[a, 60] (* Amiram Eldar, Jun 15 2022 *)
PROG
(PARI)
A345992(n) = gcd(n, A344005(n));
A354931(n) = for(k=1, oo, if(A345992(k)==n, return(k)));
CROSSREFS
Column 1 of A354930.
Sequence in context: A332543 A348914 A235268 * A105455 A345919 A246198
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jun 14 2022
STATUS
approved

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Last modified March 28 09:04 EDT 2024. Contains 371240 sequences. (Running on oeis4.)