A283462 - OEIS

A283462

Prime summand recurrence: a(n+1) = the sum of the primes <= a(n) with a(0) = 3.

3, 5, 10, 17, 58, 381, 12718, 9024109, 2626688611773, 122821324737555729064487

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OFFSET

0,1

COMMENTS

Obviously beginning with any number less than 3 goes nowhere.

Employed Kim Walisch's primesum.

LINKS

MATHEMATICA

NestList[Sum[Prime@ i, {i, PrimePi@ #}] &, 3, 8] (* Michael De Vlieger, Mar 09 2017 *)

PROG

(PARI) a(n) = if(n==0, 3, sum(k=1, primepi(a(n-1)), prime(k))); \\ Indranil Ghosh, Mar 13 2017

CROSSREFS

Subsequence of A007504.

KEYWORD

hard,nonn

AUTHOR

STATUS

approved