A131558 - OEIS

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A131558

Primes which are the sum of the first 10^k primes for some k.

2, 24133, 870530414842019, 11138479445180240497 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`Also numbers n such that A099824(n) is prime.`
	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: A173156 A123692 A132942 * A133857 A153912 A047076` `Adjacent sequences: A131555 A131556 A131557 * A131559 A131560 A131561`
	KEYWORD	`nonn,more`
	AUTHOR	`Cino Hilliard (hillcino368(AT)hotmail.com), Aug 27 2007`

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Last modified February 14 15:39 EST 2012. Contains 205635 sequences.