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A131558 Primes which are the sum of the first 10^k primes for some k. 0
2, 24133, 870530414842019, 11138479445180240497, 1948856725874605823462196012533593 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Also numbers n such that A099824(n) is prime.

LINKS

Table of n, a(n) for n=1..5.

EXAMPLE

The sum of the first 10^1 primes is 129 which is not prime and not in the sequence. The sum of the first 10^9 primes is 11138479445180240497 which is prime and in the sequence.

PROG

(PARI)

sm=0;  ct=0;  p=1;  bb=1;

{ while ( 1,

    p = nextprime(p+1);  sm += p;  ct++;

    if ( (ct==bb), if ( isprime(sm), print1(sm, ", ")); bb*=10; );

); }

CROSSREFS

Cf. A099824.

Sequence in context: A261362 A132942 A237521 * A133857 A232869 A153912

Adjacent sequences:  A131555 A131556 A131557 * A131559 A131560 A131561

KEYWORD

nonn,more

AUTHOR

Cino Hilliard, Aug 27 2007

EXTENSIONS

a(5) from David Baugh, Sep 27 2016

STATUS

approved

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Last modified December 8 01:42 EST 2019. Contains 329850 sequences. (Running on oeis4.)