A333234 Nonprimes describing the nonprime digits' positions in a way explained in the Comments section.

20, 40, 34, 64, 76, 84, 200, 106, 300, 118, 210, 270, 248, 124, 140, 324, 221, 231, 261, 338, 150, 170, 186, 364, 384, 341, 390, 371, 424, 451, 161, 481, 506, 511, 548, 570, 600, 551, 581, 611, 628, 636, 656, 664, 688, 714, 694, 749, 721, 750, 794

Offset

1,1

Comments

"20" must be read: "At position 2, there is a 0". And indeed, there is, when considering the sequence as a string of concatenated digits;

"40" reads: "At position 4, there is a 0" - which is true;

"34" reads: "At position 3, there is a 4" - which is also true;

...

"200" reads: "At position 20, there is a 0" - which is true (the central 0 in 300); etc.

Links

Carole Dubois, Table of n, a(n) for n = 1..4103

Crossrefs

Cf. A264646.

Sequence in context: A238245 A215144 A352108 * A040380 A154044 A235289

Adjacent sequences: A333231 A333232 A333233 * A333235 A333236 A333237

Keyword

base,nonn

Author

Eric Angelini and Carole Dubois, Mar 12 2020

Status

approved