A176003 a(n) = 3*(n-th noncomposite number) - 2.

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

Offset: 1

Author

Juri-Stepan Gerasimov, Apr 11 2010

Keywords

• nonn

Links

• Michael De Vlieger, Table of n, a(n) for n = 1..10000
• Barry Brent, On the constant terms of certain meromorphic modular forms for Hecke groups, arXiv:2212.12515 [math.NT], 2022.
• Barry Brent, On the Constant Terms of Certain Laurent Series, Preprints (2023) 2023061164.

Crossrefs

Cf. A001748, A008578.

Programs

Magma

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

Mathematica

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

Formula

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

Extensions

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