A002396 Inverse of reduced totient function. (Formerly M2428 N0961)

1, 3, 5, 7, 32, 11, 13, 17, 19, 25, 23, 224, 29, 31, 128, 37, 41, 43, 115, 47, 119, 53, 81, 928, 59, 61, 256, 67, 71, 73, 79, 187, 83, 203, 89, 209, 235, 97, 101, 103, 1696, 107, 109, 121, 113, 295, 287, 127, 512, 131, 299, 137, 139, 319, 323, 149, 151, 157, 1408

Offset

1,2

References

D. H. Lehmer, Guide to Tables in the Theory of Numbers. Bulletin No. 105, National Research Council, Washington, DC, 1941, pp. 7-10.

N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Links

T. D. Noe, Table of n, a(n) for n = 1..1000

C. Moreau, Sur quelques théorèmes d'arithmétique, Nouvelles Annales de Mathématiques, 17 (1898), 293-307.

Mathematica

max = 1000; Clear[a]; a[n_] := 100*n; a[2432] = 623104 (* given by T. D. Noe *); For[m = 0; n = 1, m <= max, n = If[n == 1, 2, n + 2], For[k = n, k <= a[n], k++, If[CarmichaelLambda[k] == n, m++; Print[{n, m, k}]; a[m] = k; Break[]]]]; Table[a[n], {n, 1, max}] (* Jean-François Alcover, Jan 15 2015 *)

Crossrefs

Sequence in context: A006378 A162714 A359044 * A302099 A029508 A256935

Adjacent sequences: A002393 A002394 A002395 * A002397 A002398 A002399

Keyword

nonn,nice,easy

Author

N. J. A. Sloane

Extensions

More terms from Brent Lehman (mailbjl(AT)yahoo.com), Apr 26 2005

Status

approved