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A184899 n such that the n-th centered 12-gonal number is prime. Indices of prime star numbers. 3
2, 3, 4, 6, 8, 9, 10, 11, 13, 14, 19, 20, 21, 23, 24, 31, 32, 33, 34, 36, 37, 39, 42, 43, 44, 46, 47, 48, 52, 56, 59, 61, 66, 68, 74, 75, 78, 79, 85, 87, 89, 94, 96, 98, 101, 102, 105, 107, 108, 110, 113, 118, 121, 124, 125, 127, 130, 131, 133, 135, 136, 138 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Zak Seidov, Table of n, a(n) for n = 1..1000

FORMULA

{n: 6*n^2 - 6*n + 1 is prime} = {n: A003154(n) is in A000040}.

EXAMPLE

98 is in the sequence because 6*98^2 - 6*98 + 1 = 57037 is prime.

MATHEMATICA

Select[Range[140], PrimeQ[6#^2-6#+1]&]  (* Harvey P. Dale, Feb 16 2011 *)

CROSSREFS

Cf. A083577, A000040, A003154.

Sequence in context: A050078 A075449 A005458 * A039034 A047302 A121217

Adjacent sequences:  A184896 A184897 A184898 * A184900 A184901 A184902

KEYWORD

nonn,easy

AUTHOR

Jonathan Vos Post, Feb 01 2011

STATUS

approved

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Last modified November 15 22:20 EST 2018. Contains 317252 sequences. (Running on oeis4.)