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!)
A090420 Numbers having a unique representation as concatenation of primes in binary. 3
2, 3, 5, 7, 10, 13, 14, 15, 17, 19, 21, 22, 30, 37, 41, 42, 53, 54, 55, 58, 62, 67, 70, 73, 78, 81, 85, 86, 89, 90, 97, 101, 103, 107, 111, 115, 117, 122, 131, 137, 139, 141, 143, 149, 150, 159, 163, 165, 166, 169, 170, 177, 193, 197, 199, 211, 214, 215, 218 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

A090418(a(n)) = 1; subsequence of A090421.

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

PROG

(Haskell)

a090420 n = a090420_list !! (n-1)

a090420_list = filter ((== 1) . a090418) [1..]

-- Reinhard Zumkeller, Aug 07 2012

CROSSREFS

Cf. A004676, A007088.

Cf. A090423 (subsequence).

Sequence in context: A109598 A117959 A117952 * A162999 A064509 A096221

Adjacent sequences:  A090417 A090418 A090419 * A090421 A090422 A090423

KEYWORD

nonn,base

AUTHOR

Reinhard Zumkeller, Nov 30 2003

EXTENSIONS

Based on corrections in A090418, data recomputed by Reinhard Zumkeller, Aug 07 2012

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 April 10 18:17 EDT 2021. Contains 342853 sequences. (Running on oeis4.)