The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 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 Table of n, a(n) for n=1..77. 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 Adjacent sequences: A354991 A354992 A354993 * A354995 A354996 A354997 KEYWORD nonn AUTHOR Antti Karttunen, Jun 17 2022 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

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