login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A191914 Smallest number m greater than n such that the happy couples of m and n have a member in common. 2
2, 3, 5, 6, 7, 8, 10, 12, 12, 11, 13, 15, 17, 18, 20, 20, 19, 22, 23, 24, 28, 32, 26, 28, 30, 27, 29, 35, 31, 35, 37, 34, 39, 38, 42, 42, 41, 40, 52, 46, 43, 48, 47, 52, 55, 54, 50, 56, 56, 51, 53, 60, 58, 62, 70, 63, 69, 59, 61, 68, 65, 66, 72, 72, 67, 86 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The intersection of {A007966(n),A007967(n)} and {A007966(a(n)),A007967(a(n))} is not empty, but the intersection of {A007966(n),A007967(n)} and {A007966(m),A007967(m)} is empty for n<m<a(n).

LINKS

Table of n, a(n) for n=1..66.

J. H. Conway, On Happy Factorizations, J. Integer Sequences, Vol. 1, 1998, #1.

EXAMPLE

Let hc(n) = (A007966(n),A007967(n)),

n=6, a(6) =  8: hc(6) = (2,3) and hc(8)  = (2,4)  with common 2,

n=7, a(7) = 10: hc(7) = (7,1) and hc(10) = (1,10) with common 1,

n=8, a(8) = 12: hc(8) = (2,4) and hc(12) = (3,4)  with common 4,

n=9, a(9) = 12: hc(9) = (3,3) and hc(12) = (3,4)  with common 3.

CROSSREFS

Sequence in context: A181807 A059870 A179813 * A329898 A145353 A013936

Adjacent sequences:  A191911 A191912 A191913 * A191915 A191916 A191917

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Jun 19 2011

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 January 27 15:47 EST 2021. Contains 340467 sequences. (Running on oeis4.)