A282407 Semiprimes p such that next semiprime after p is p + 40.

741841, 1633213, 1889467, 1946677, 2210557, 2440203, 2655427, 2660857, 2729091, 2749273, 2774911, 3077323, 3724909, 3977473, 4021507, 4030891, 4323301, 4372337, 4408581, 4421713, 4608574, 4640419, 4836223, 5640861, 5691531, 6148599, 6166101, 6429853, 6786523

Offset

1,1

Comments

Note that a(1) = 741841 = A131109(40).

Smallest difference between two consecutive terms occurs first at a(22060) = 1141901643 because a(22061) = 1141901683 = 1141901643 + 40.

Links

Zak Seidov, Table of n, a(n) for n = 1..23671

Prog

(PARI) is(p) = if(bigomega(p)==2 && bigomega(p+40)==2, for(i=p+1, p+39, if(bigomega(i)==2, return(0))); 1); \\ Jinyuan Wang, May 23 2021

Crossrefs

Cf. A001358, A131109, A217030, A217335, A217357.

Sequence in context: A249317 A251487 A227905 * A147707 A133183 A119403

Adjacent sequences: A282404 A282405 A282406 * A282408 A282409 A282410

Keyword

nonn

Author

Zak Seidov, Feb 14 2017

Status

approved