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A333234 Nonprimes describing the nonprime digits' positions in a way explained in the Comments section. 2
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 (list; graph; refs; listen; history; text; internal format)
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

Sequence in context: A054288 A238245 A215144 * 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

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Last modified January 17 17:47 EST 2022. Contains 350402 sequences. (Running on oeis4.)