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A349547
a(n) is the length of the n-th row of A348575.
3
9, 28, 100, 3660, 2, 4, 34, 279, 1342, 24486, 41, 4, 9, 37, 3373, 30332, 10768, 89207, 9888780, 118322, 103912, 1083421, 1095431404, 1182371, 33970573, 116430219, 3152744167, 24330557, 27560841783
OFFSET
1,1
COMMENTS
Terms computed by Claudio Meller.
EXAMPLE
When A348575 is written as an irregular triangle, the first three rows are:
1, ..., 37: 9 terms
10, ..., 388: 28 terms
19, ..., 4969: 100 terms
The lengths of the rows are [9, 28, 100] respectively, the same as the first three terms of this sequence.
a(30) exceeds 4242640687120 (perhaps by orders of magnitude); see A349548. - Jon E. Schoenfield, Nov 29 2021
MATHEMATICA
seq[len_] := Module[{s = {1}, sq = {}, i = 1, d}, While[Length[sq] < len, If[MemberQ[s, (d = Plus @@ IntegerDigits[s[[-1]]])], AppendTo[s, s[[-1]] + i], AppendTo[s, d]; AppendTo[sq, i]; i = 0]; i++]; sq]; seq[15] (* Amiram Eldar, Nov 23 2021 *)
CROSSREFS
Sequence in context: A294567 A053819 A294287 * A085292 A198059 A181090
KEYWORD
nonn,base,hard,more
AUTHOR
Rodolfo Kurchan, Nov 21 2021
EXTENSIONS
a(23)-a(29) from Jon E. Schoenfield, Nov 30 2021
STATUS
approved