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#57 by Charles R Greathouse IV at Thu Sep 08 08:44:38 EDT 2022
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| PROG
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(MAGMAMagma) [n:n in [1..700] | IsPrime(&+PrimesUpTo(NthPrime(n))) ]; // Marius A. Burtea, Jan 04 2019
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Discussion
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| Thu Sep 08
| 08:44
| OEIS Server: https://oeis.org/edit/global/2944
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#56 by Michel Marcus at Sun Feb 28 12:17:25 EST 2021
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#55 by Joerg Arndt at Sun Feb 28 11:04:10 EST 2021
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#54 by Michael S. Branicky at Sun Feb 28 10:31:38 EST 2021
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#53 by Michael S. Branicky at Sun Feb 28 10:31:36 EST 2021
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| PROG
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(Python)
from sympy import isprime, prime
def aupto(lim):
s = 0
for k in range(1, lim+1):
s += prime(k)
if isprime(s): print(k, end=", ")
aupto(680) # Michael S. Branicky, Feb 28 2021
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| STATUS
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reviewed
editing
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#52 by Joerg Arndt at Sun Feb 28 10:13:40 EST 2021
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#51 by Chun Lok Yiu at Sun Feb 28 08:31:41 EST 2021
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Discussion
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| Sun Feb 28
| 10:13
| Joerg Arndt: Thanks!
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#50 by Chun Lok Yiu at Sun Feb 28 08:31:11 EST 2021
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| EXAMPLE
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6 is a term because the sum of the first six primes 2 + 3 + 5 + 7 + 11 + 13 = 3141 is prime.
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| STATUS
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approved
editing
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Discussion
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| Sun Feb 28
| 08:31
| Chun Lok Yiu: Fixed typo.
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#49 by Jon E. Schoenfield at Tue Feb 19 16:02:25 EST 2019
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#48 by Jon E. Schoenfield at Tue Feb 19 16:02:21 EST 2019
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| NAME
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Numbers nk such that the sum of the first nk primes is prime.
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| FORMULA
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a(n) = A000720(A013917(n)))).
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| EXAMPLE
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6 is a term because the sum of the six first six primes 2 + 3 + 5 + 7 + 11 + 13 = 31 is prime.
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| STATUS
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approved
editing
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