A188937 -id:A188937 - cp's OEIS frontend

A083088 First column of table A083087.

1, 2, 4, 6, 7, 9, 11, 12, 14, 16, 18, 19, 21, 23, 24, 26, 28, 30, 31, 33, 35, 36, 38, 40, 41, 43, 45, 47, 48, 50, 52, 53, 55, 57, 59, 60, 62, 64, 65, 67, 69, 70, 72, 74, 76, 77, 79, 81, 82, 84, 86, 88, 89, 91, 93, 94, 96, 98, 100, 101, 103, 105, 106, 108, 110, 111, 113, 115

Offset: 0

Paul D. Hanna, Apr 21 2003

It appears that A188937 gives the positions of 0 in the zero-one sequence A188037; complement of A080754. - Clark Kimberling, Mar 19 2011

Is this (apart from the prefixed a(0)) the same as A080755? - R. J. Mathar, Jul 31 2025

Cf. A083087, A083044, A083047, A083050.

Cf. A080755.

z:=70; x:=1+Sqrt(2); [ Floor(n*x/(x-1))+1: n in [0..z] ]; // Klaus Brockhaus, Jan 04 2011

f[n_] := Floor[n/Sqrt@2 + n + 1]; Array[f, 68, 0]

a(n) = floor(n*x/(x-1)) + 1, n>=0, where x=1+sqrt(2).

a(n) = floor(n/sqrt(2)) + n + 1 = 1+n+A049472(n).

This entry formerly contained an erroneous comment, which was deleted by N. J. A. Sloane, Jan 30 2008

A188936 Numbers k such that (2^k + 3)^2 - 8 is prime.

Original entry on oeis.org

1, 2, 3, 4, 5, 6, 8, 10, 11, 12, 19, 27, 28, 32, 36, 48, 56, 61, 131, 170, 251, 750, 771, 779, 790, 874, 1176, 1728, 2604, 3541, 5394, 6203, 9230, 14666, 15680, 26712, 45840, 46019, 56220

Offset: 1

N. J. A. Sloane, Apr 14 2011

Daniel Shanks, Gauss's ternary form reduction and the 2-Sylow subgroup, Math. Comp. 25 (1971), 837-853.

Cf. A188129, A188661, A188937.

for(n=1,10^6,if(isprime((2^n+3)^2-8),print1(n,", "))); /* Joerg Arndt, Apr 25 2011 */

a(22)-a(30) from Joerg Arndt, Apr 25 2011
a(31)-a(33) from Vincenzo Librandi, May 13 2011
a(36) from Charles R Greathouse IV, Oct 10 2011
a(37)-a(39) from Charles R Greathouse IV, Oct 11 2011
a(34)-a(35) inserted by Michael S. Branicky, Jul 25 2024

cp's OEIS Frontend

A083088 First column of table A083087.

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