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A354994 Numbers k such that A344005(d) < A344005(k) for all proper divisors d of k. 3
1, 3, 4, 5, 7, 8, 9, 11, 13, 15, 16, 17, 19, 23, 24, 25, 27, 28, 29, 31, 32, 33, 35, 37, 40, 41, 43, 44, 45, 47, 49, 51, 53, 59, 60, 61, 63, 64, 65, 67, 69, 71, 73, 76, 77, 79, 81, 83, 84, 85, 87, 88, 89, 91, 92, 95, 96, 97, 99, 101, 103, 104, 107, 108, 109, 112, 113, 115, 117, 119, 121, 123, 124, 125, 127, 128, 131 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
MATHEMATICA
s[n_] := Module[{m = 1}, While[!Divisible[m*(m + 1), n], m++]; m]; q[n_] := Module[{sn = s[n]}, DivisorSum[n, If[s[#] < sn, 0, 1] &, # < n &] == 0]; Select[Range[150], q] (* Amiram Eldar, Jun 17 2022 *)
PROG
(PARI)
A344005(n) = for(m=1, oo, if((m*(m+1))%n==0, return(m))); \\ From A344005
A354993(n) = { my(x=A344005(n)); fordiv(n, d, if(A344005(d)==x, return(d==n))); };
isA354994(n) = A354993(n);
CROSSREFS
Positions of 1's in A354991 and in A354999.
Cf. A344005, A354993 (characteristic function).
Cf. also A344881, A345944.
Sequence in context: A247786 A330565 A139711 * A214585 A196036 A341416
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jun 17 2022
STATUS
approved

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Last modified May 27 12:27 EDT 2024. Contains 372858 sequences. (Running on oeis4.)