A338073 Rearrangement of positive integers except 3 defined by A083758.

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

Offset: 1

Author

N. J. A. Sloane, Oct 20 2020

Keywords

• nonn

Comments

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

Apply PrimePi (A000720) to the terms of A083758.

Crossrefs

Cf. A000720, A083758, A083759, A338072.

Programs

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