A390585 a(n) is the first nonprime k such that the sum over the A390584(n) consecutive nonprimes starting at k equals A390584(n)^2.

1, 1, 18, 1512, 2282, 3261, 154533, 485242, 495996, 1149147, 1320592, 3873040, 114240768

Offset

1,3

Links

Table of n, a(n) for n=1..13.

Example

a(2) = 1: the 8 consecutive nonprimes summing to A390584(2)^2 = 64 are 1, 4, 6, 8, 9, 10, 12, 14.

Crossrefs

Cf. A018252, A390584.

Sequence in context: A160252 A276015 A210823 * A258336 A211310 A160307

Adjacent sequences: A390582 A390583 A390584 * A390586 A390587 A390588

Keyword

nonn,hard,more

Author

Hugo Pfoertner, Nov 11 2025

Extensions

a(7)-a(9) from Michael S. Branicky, Nov 11 2025

a(10)-a(13) from Bert Dobbelaere, Nov 12 2025

Status

approved