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A350193 Indices that give distinct values of A350090 in the order in which they appear. 1
0, 1, 5, 7, 22, 33, 124, 187, 757, 852, 876, 1149, 1541, 5951, 6767, 8454, 10067, 15555, 20272, 29751, 51721, 59662, 89055, 90088, 92489, 161673, 207737, 217341, 225622, 361054, 452639, 530990, 560684, 669999, 733454, 1000067, 1866828, 2090121, 2464677, 3148962 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..40.

MATHEMATICA

With[{s = Table[Count[Range[0, n - 1], _?(IntegerQ@ Sqrt[4 # + 1] &[(3 n (n + 1) + 1) - (3 # (# + 1) + 1)] &)], {n, 0, 2^10}]}, Map[-1 + FirstPosition[s, #][[1]] &, DeleteDuplicates@ s]] (* Michael De Vlieger, Dec 19 2021, after Amiram Eldar at A350090 *)

CROSSREFS

Cf. A002378, A003215, A350090, A350120, A350192.

Sequence in context: A165144 A084164 A036498 * A248086 A076409 A294154

Adjacent sequences:  A350190 A350191 A350192 * A350194 A350195 A350196

KEYWORD

nonn

AUTHOR

Michel Marcus, Dec 19 2021

EXTENSIONS

a(1) = 0 inserted by and more terms from Jinyuan Wang, Dec 19 2021

STATUS

approved

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Last modified September 30 17:27 EDT 2022. Contains 357106 sequences. (Running on oeis4.)