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A301707 a(n) = n * Sum_{k prime<=n} k. 0
0, 4, 15, 20, 50, 60, 119, 136, 153, 170, 308, 336, 533, 574, 615, 656, 986, 1044, 1463, 1540, 1617, 1694, 2300, 2400, 2500, 2600, 2700, 2800, 3741, 3870, 4960, 5120, 5280, 5440, 5600, 5760, 7289, 7486, 7683, 7880, 9758, 9996, 12083, 12364, 12645, 12926, 15416, 15744 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..48.

FORMULA

a(n) = n * A034387(n).

EXAMPLE

a(6) = 6 * Sum_{k primes<=6} = 6 * (2+3+5) = 6 * 10 = 60.

MATHEMATICA

Array[# Sum[Prime@ i, {i, PrimePi@ #}] &, 48] (* Michael De Vlieger, Apr 10 2018 *)

PROG

(PARI) a(n) = n*sum(k=1, n, k*isprime(k)); \\ Michel Marcus, Mar 26 2018

CROSSREFS

Cf. A034387.

Sequence in context: A022133 A212921 A225562 * A100783 A170850 A297711

Adjacent sequences:  A301704 A301705 A301706 * A301708 A301709 A301710

KEYWORD

nonn

AUTHOR

Pedro Caceres, Mar 25 2018

EXTENSIONS

More terms from Michel Marcus, Apr 09 2018

STATUS

approved

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Last modified February 19 09:57 EST 2020. Contains 332041 sequences. (Running on oeis4.)