A354937 - OEIS

A354937

Row 7 of A354940: Numbers k for which A345992(k) = 7, divided by 7.

4, 5, 8, 11, 15, 19, 22, 25, 29, 32, 39, 43, 47, 50, 53, 57, 61, 64, 67, 71, 78, 81, 89, 92, 95, 99, 103, 106, 109, 113, 127, 131, 134, 137, 141, 151, 155, 162, 169, 173, 176, 179, 183, 190, 193, 197, 211, 218, 229, 232, 239, 243, 256, 257, 263, 267, 271, 274, 277, 281, 291, 295, 302, 309, 313, 316, 323, 337, 344

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OFFSET

1,1

COMMENTS

Apparently, all terms are either of the form 7k+1 (in A016993), 7k+4 (A017029) or 7k+5 (A017041).

LINKS

Table of n, a(n) for n=1..69.

MATHEMATICA

q[n_] := Module[{m = 1}, While[!Divisible[m*(m + 1), 7*n], m++]; GCD[7*n, m] == 7]; Select[Range[345], q] (* Amiram Eldar, Jun 17 2022 *)

PROG

(PARI) A354937(n) = A354940sq(7, n);

CROSSREFS