A379810 Composite numbers in A381019 which are immediately followed by another composite number, in order of their appearance.

15, 46, 104, 305, 261, 1691, 380, 406, 508, 1175, 3281, 7729, 2827, 10877, 6289, 13289, 1737, 4829, 2945, 3205, 9673, 1940, 21253, 1970, 31921, 21127, 34861, 5457, 22219, 120983, 99893, 110843, 148613, 105029, 164107, 12905, 89279, 15245, 195617, 79909, 89827

Offset

1,1

Comments

Conjecture: For any k >= 1, A381019 contains k consecutive composite terms.

When is the first instance of three consecutive composite terms?

Links

Table of n, a(n) for n=1..41.

Formula

a(n) = A381019(A381120(n)).

Crossrefs

Cf. A381019, A381120.

Sequence in context: A041434 A136430 A139278 * A041436 A219885 A042007

Adjacent sequences: A379807 A379808 A379809 * A379811 A379812 A379813

Keyword

nonn

Author

N. J. A. Sloane, Feb 15 2025

Extensions

a(6)-a(8) from Michael De Vlieger, Feb 15 2025

More terms from Jinyuan Wang, Feb 23 2025

Status

approved