A175216 The first nonprimes after the primes.

4, 4, 6, 8, 12, 14, 18, 20, 24, 30, 32, 38, 42, 44, 48, 54, 60, 62, 68, 72, 74, 80, 84, 90, 98, 102, 104, 108, 110, 114, 128, 132, 138, 140, 150, 152, 158, 164, 168, 174, 180, 182, 192, 194, 198, 200, 212, 224, 228, 230, 234, 240, 242, 252, 258, 264, 270, 272

Offset

1,1

Comments

Essentially the same as A135731, A055670, A028815 and A008864. [R. J. Mathar, Mar 13 2010]

Links

G. C. Greubel, Table of n, a(n) for n = 1..10000

Formula

a(1) = 4, for n >= 2, a(n) = A008864(n) = A000040(n) + 1.

Mathematica

Table[Prime[n] +1 +Boole[n==1], {n, 100}] (* G. C. Greubel, Aug 06 2024 *)

Prog

(Magma) [n eq 1 select 4 else NthPrime(n) +1: n in [1..100]]; // G. C. Greubel, Aug 06 2024
(SageMath)
def A175216(n): return nth_prime(n) +1 +int(n==1)
[A175216(n) for n in range(1, 101)] # G. C. Greubel, Aug 06 2024

Crossrefs

Cf. A000040, A008864, A028815, A055670, A135731.

Sequence in context: A090682 A011982 A282939 * A053639 A100090 A222732

Adjacent sequences: A175213 A175214 A175215 * A175217 A175218 A175219

Keyword

nonn,easy

Author

Jaroslav Krizek, Mar 06 2010

Status

approved