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 A271468 List of indices i such that A269347(3*i) != 3*(i^2 + 1). 2
 1, 5, 10, 15, 17, 20, 25, 28, 30, 34, 35, 37, 40, 45, 50, 51, 55, 56, 60, 65, 68, 70, 74, 75, 80, 82, 84, 85, 90, 95, 100, 102, 105, 106, 110, 111, 112, 115, 119, 120, 122, 125, 130, 135, 136, 140, 145, 148, 150, 153, 155, 160, 164, 165, 168, 170, 175, 180 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Equivalently, this sequences is a list of indices i such that A271328(i) != i^2 + 1. If k is in A271328, then k is in this sequence. All multiples of a(k) are in the sequence for k > 1. LINKS Peter Kagey, Table of n, a(n) for n = 1..10000 EXAMPLE A269347(3*1) = 3 != 3*(1^2 + 1) = 6 so 1 is in the sequence. A269347(3*2) = 15 = 3*(2^2 + 1) so 2 is not in the sequence. A269347(3*3) = 30 = 3*(3^2 + 1) so 3 is not in the sequence. A269347(3*4) = 51 = 3*(4^2 + 1) so 4 is not in the sequence. A269347(3*5) = 84 != 3*(5^2 + 1) = 78 so 5 is in the sequence. CROSSREFS Sequence in context: A236848 A236835 A236844 * A313669 A254063 A313670 Adjacent sequences:  A271465 A271466 A271467 * A271469 A271470 A271471 KEYWORD nonn AUTHOR Peter Kagey, Apr 08 2016 STATUS approved

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Last modified August 24 16:21 EDT 2019. Contains 326295 sequences. (Running on oeis4.)