A367349 List of numbers in the range 1 to 99 missing from A366487.

4, 10, 15, 20, 24, 30, 40, 44, 50, 60, 64, 65, 70, 80, 84, 90

Offset

1,1

Comments

These numbers do not occur as differences between successive terms in A121805.

Links

Table of n, a(n) for n=1..16.

Carlos Rivera, Puzzle 980. The "Commas" sequence, The Prime Puzzles and Problems Connection.

Mathematica

a[1] = 1; a[n_] := a[n] = For[r = Mod[a[n - 1], 10]; y = 0, y <= 9, y++, If[y == IntegerDigits[#][[1]], Return[#]] &[a[n - 1] + 10 r + y]]; Complement[Range[99], Union@ Differences@ Array[a, 10^6]] (* Michael De Vlieger, Nov 18 2023, after Jean-François Alcover at A121805 *)

Crossrefs

Cf. A121805, A366487.

Sequence in context: A310453 A310454 A310455 * A310456 A063295 A310457

Adjacent sequences: A367346 A367347 A367348 * A367350 A367351 A367352

Keyword

nonn,base,fini,full

Author

N. J. A. Sloane, Nov 17 2023

Status

approved