A064923 a(n) = Min { k | A064920(k) = n }.

2, 3, 6, 5, 10, 7, 14, 16, 24, 11, 22, 13, 26, 39, 52, 17, 34, 19, 38, 57, 76, 23, 46, 69, 72, 115, 120, 29, 58, 31, 62, 64, 96, 155, 160, 37, 74, 111, 148, 41, 82, 43, 86, 129, 172, 47, 94, 141, 144, 235, 240, 53, 106, 159, 162, 265, 270, 59, 118, 61, 122, 183, 244

Offset

2,1

Comments

A064920(a(n)) = n. a(n) = n iff n is prime.

Links

Harry J. Smith, Table of n, a(n) for n = 2..1000

Prog

(PARI) gpf(n)= { local(f); f=factor(n)~; return(f[1, length(f)]) } { for (n=2, 1000, k=1; until (m==n, k++; g=gpf(k); m=k / g + g - 1); write("b064923.txt", n, " ", k) ) } \\ Harry J. Smith, Sep 29 2009

Crossrefs

Cf. A064920, A064924, A064919.

Sequence in context: A043547 A338702 A064919 * A064924 A196330 A332462

Adjacent sequences: A064920 A064921 A064922 * A064924 A064925 A064926

Keyword

nonn

Author

Reinhard Zumkeller, Oct 14 2001

Status

approved