login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A064742 Total number of primes (with multiplicity) dividing A064413(n). 5
0, 1, 2, 2, 1, 2, 3, 3, 2, 1, 2, 3, 2, 1, 2, 4, 4, 3, 2, 1, 2, 3, 3, 2, 2, 3, 2, 1, 2, 4, 5, 2, 1, 2, 3, 2, 1, 2, 3, 4, 3, 2, 1, 2, 5, 3, 3, 4, 4, 2, 3, 4, 2, 2, 3, 2, 1, 2, 3, 2, 1, 2, 5, 6, 3, 2, 1, 2, 3, 3, 3, 5, 2, 1, 2, 4, 4, 2, 4, 2, 1, 2, 4, 2, 2, 4, 3, 2, 1, 2, 6, 3, 2, 4, 3, 3, 3, 5, 2, 1, 2, 3, 3, 5, 3 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..105.

J. C. Lagarias, E. M. Rains and N. J. A. Sloane, The EKG sequence, arXiv:math/0204011 [math.NT], 2002.

J. C. Lagarias, E. M. Rains and N. J. A. Sloane, The EKG sequence, Exper. Math. 11 (2002), 437-446.

Index entries for sequences related to EKG sequence

MATHEMATICA

terms = 105;

ekg[s_] := Block[{m = s[[-1]], k = 3}, While[MemberQ[s, k] || GCD[m, k] == 1, k++]; Append[s, k]];

EKG = Nest[ekg, {1, 2}, terms-2];

PrimeOmega /@ EKG (* Jean-Fran├žois Alcover, Sep 02 2018, after Robert G. Wilson v in A064413 *)

CROSSREFS

Sum of "digits" of A064743.

Sequence in context: A319416 A284559 A284583 * A227185 A284579 A167489

Adjacent sequences:  A064739 A064740 A064741 * A064743 A064744 A064745

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Oct 18 2001

EXTENSIONS

More terms from Vladeta Jovovic, Oct 20 2001

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified February 21 18:45 EST 2019. Contains 320376 sequences. (Running on oeis4.)