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!)
A080570 Number of 1's in partition of n-th Ulam number into sum of two distinct Ulam numbers. 1
1, 0, 1, 2, 2, 2, 3, 3, 4, 4, 6, 6, 8, 8, 11, 12, 13, 15, 14, 17, 18, 19, 20, 21, 23, 23, 24, 26, 28, 32, 31, 32, 35, 36, 37, 43, 43, 44, 44, 45, 47, 50, 51, 53, 53, 56, 56, 57, 57, 61, 62, 62, 65, 68, 73, 76, 77, 78, 83, 83, 84, 84, 87, 88, 90, 92, 94, 94, 97, 98, 98, 101, 101 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..73.

EXAMPLE

For n=7: A002858(7) = 11 = 3+8 = (1+2)+(2+6) = (1+2)+(2+(2+4)) = (1+2)+(2+(2+(1+3))) = (1+2)+(2+(2+(1+(1+2)))). Number of 1's in (1+2)+(2+(2+(1+(1+2)))) is 3, so a(7) = 3.

CROSSREFS

Cf. A002858.

Sequence in context: A032739 A240868 A029149 * A163001 A239913 A323701

Adjacent sequences:  A080567 A080568 A080569 * A080571 A080572 A080573

KEYWORD

easy,nonn

AUTHOR

Naohiro Nomoto, Feb 22 2003

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 25 14:40 EST 2021. Contains 341609 sequences. (Running on oeis4.)