login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A338073 Rearrangement of positive integers except 3 defined by A083758. 3
1, 2, 5, 4, 13, 11, 7, 38, 9, 22, 45, 53, 10, 12, 17, 44, 49, 50, 52, 85, 158, 68, 55, 229, 97, 8, 62, 269, 256, 159, 41, 73, 54, 179, 581, 210, 98, 297, 86, 34, 43, 273, 199, 122, 16, 153, 140, 29, 709, 521, 64, 163, 87, 389, 1145, 106, 164, 231, 26, 177, 28, 464, 51, 258, 398, 391 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

This is conjectured to be a permutation of all positive integers except 3.

Apply PrimePi (A000720) to the terms of A083758.

LINKS

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

PROG

(PARI) a338073(m)={my(np=1000*m, pused=vectorsmall(np), digp=[]); for(n=1, m, my(found=0); for(k=1, np, if(!pused[k], my(add=digits(prime(k)), pc=concat(digp, add)); if(ispseudoprime(fromdigits(pc)), print1(k, ", "); digp=pc; pused[k]=1; found=1; break))); if(!found, break))};

a338073(66) \\ Hugo Pfoertner, Oct 21 2020

CROSSREFS

Cf. A000720, A083758, A083759, A338072.

Sequence in context: A073122 A277020 A084410 * A080067 A117824 A122212

Adjacent sequences: A338070 A338071 A338072 * A338074 A338075 A338076

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Oct 20 2020

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 29 23:01 EST 2023. Contains 359939 sequences. (Running on oeis4.)