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A061888 Numbers n such that n^2 is the sum of the first k primes for some k. 3
10, 5063, 14573, 17098, 1916357, 468726713734 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..6.

G. L. Honaker Jr. and C. Caldwell, Prime Curios!: 9

C. Rivera, PrimePuzzles.Net, Problem 9: Sum of first k primes is perfect square

FORMULA

a(n)^2 = A061890(n).

EXAMPLE

10^2 = 2+3+5+7+11+13+17+19+23, so 10 is in the sequence.

CROSSREFS

Cf. A033997, A033998, A061890.

Sequence in context: A223055 A308488 A180419 * A117803 A199520 A169621

Adjacent sequences:  A061885 A061886 A061887 * A061889 A061890 A061891

KEYWORD

nonn

AUTHOR

David W. Wilson, May 12, 2001

EXTENSIONS

468726713734 from Giovanni Resta, May 27 2003

Edited by Ray Chandler, Mar 20 2007

STATUS

approved

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Last modified September 26 10:59 EDT 2020. Contains 337351 sequences. (Running on oeis4.)