A282191 - OEIS

A282191

Odd numbers divisible by 3 which are neither of the form p + 3^m + 1 nor of the form p + 3^m - 1 with p prime.

5973, 22605, 28251, 42663, 47697, 50481, 50643, 52353, 58527, 63897, 71757, 76197, 86049, 92289, 92523, 93675, 94635, 96891, 104457, 105087, 105723, 112875, 117873, 118731, 121827, 122883, 129417, 131289, 137295, 138777, 141195, 141825, 142857, 143433

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OFFSET

1,1

COMMENTS

Numbers whose distance to both nearest neighbor numbers in A282430 is 1.

LINKS

Table of n, a(n) for n=1..34.

PROG

(Magma) lst:=[]; for n in [3..143433 by 6] do c:=0; e:=Floor(Log(3, n)); m:=0; while m le e do a:=n-3^m; if IsPrime(a+1) or IsPrime(a-1) then break; end if; c+:=1; m+:=1; end while; if c eq e+1 then Append(~lst, n); end if; end for; lst;

CROSSREFS

Cf. A282430.

Sequence in context: A032658 A157666 A176374 * A328327 A364861 A237011

Adjacent sequences: A282188 A282189 A282190 * A282192 A282193 A282194

KEYWORD

nonn

AUTHOR

Arkadiusz Wesolowski, Feb 15 2017

STATUS

approved