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A176003 a(n) = 3*(n-th noncomposite number) - 2. 3
1, 4, 7, 13, 19, 31, 37, 49, 55, 67, 85, 91, 109, 121, 127, 139, 157, 175, 181, 199, 211, 217, 235, 247, 265, 289, 301, 307, 319, 325, 337, 379, 391, 409, 415, 445, 451, 469, 487, 499, 517, 535, 541, 571, 577, 589, 595, 631, 667, 679, 685, 697, 715, 721, 751 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..55.

FORMULA

a(n) = 3*A008578(n) - 2. - R. J. Mathar, Apr 16 2010

MATHEMATICA

Join[{1}, Table[3 Prime[n] - 2, {n, 60}]] (* Vincenzo Librandi, Dec 08 2015 *)

PROG

(MAGMA) [3*NthPrime(n)-2: n in [0..58]]; // Vincenzo Librandi, Dec 08 2015

CROSSREFS

Cf. A001748, A008578.

Sequence in context: A194073 A023496 A191868 * A216880 A144730 A058570

Adjacent sequences:  A176000 A176001 A176002 * A176004 A176005 A176006

KEYWORD

nonn

AUTHOR

Juri-Stepan Gerasimov, Apr 11 2010

EXTENSIONS

Entries checked by R. J. Mathar, Apr 16 2010

STATUS

approved

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Last modified October 22 07:06 EDT 2021. Contains 348160 sequences. (Running on oeis4.)