A330723 Numbers k such that A033468(k) = A033468(k+1).

7, 29, 45, 49, 67, 71, 75, 97, 99, 111, 121, 127, 131, 141, 143, 161, 171, 173, 199, 211, 215, 227, 241, 253, 265, 267, 273, 277, 285, 287, 293, 301, 321, 333, 335, 337, 341, 347, 359, 379, 381, 391, 393, 407, 417, 437, 447, 449, 455, 459, 475, 493, 497, 503, 511, 515, 519, 523, 525, 537, 539

Offset

1,1

Comments

Are all terms odd?

Does the sequence have nonzero asymptotic density?

Links

Robert Israel, Table of n, a(n) for n = 1..10000

Example

a(1) = 7 is in the sequence because A033468(7) = A033468(8) = 204425.

Maple

S:= 0: R:= NULL: count:= 0: t:= 0:
for i from 0 while count < 100 do
  S:= S + 1/(i^2+1);
  s:= t; t:= denom(S);
  if s = t then R:= R, i-1; count:= count+1 fi
od:
R;

Crossrefs

Cf. A033468.

Sequence in context: A075583 A103603 A045465 * A165492 A084201 A031380

Adjacent sequences: A330720 A330721 A330722 * A330724 A330725 A330726

Keyword

nonn

Author

Robert Israel, Apr 27 2020

Status

approved