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A061888 Numbers k such that k^2 is the sum of the first m primes for some m. 3
10, 5063, 14573, 17098, 1916357, 468726713734 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
G. L. Honaker Jr. and C. Caldwell, Prime Curios!: 9
Carlos Rivera, Problem 9: Sum of first k primes is perfect square, The Prime Puzzles and Problems Connection.
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
Sequence in context: A223055 A308488 A180419 * A348082 A117803 A356041
KEYWORD
nonn,hard,more
AUTHOR
David W. Wilson, May 12 2001
EXTENSIONS
a(6) from Giovanni Resta, May 27 2003
Edited by Ray Chandler, Mar 20 2007
STATUS
approved

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Last modified March 19 01:57 EDT 2024. Contains 370952 sequences. (Running on oeis4.)