A115719 Products of two primes that are not Chen primes.

1849, 2623, 3139, 3397, 3721, 4171, 4429, 4453, 4819, 5329, 5767, 5917, 6241, 6283, 6493, 7009, 7081, 7439, 7519, 7663, 8137, 8299, 9211, 9409, 9589, 9847, 9943, 9991, 10363, 10553, 10609, 11023, 11653, 11773, 11899, 11911, 11929, 12169, 12629, 12877

Offset

1,1

Comments

Subset of semiprimes (A001358) such that neither prime factor is a Chen prime (A109611).

Links

Table of n, a(n) for n=1..40.

Example

a(1) = 1849 = A102540(1)*A102540(1) = 43*43.
a(2) = 2623 = A102540(1)*A102540(2) = 43*61.
a(36) = 14701 = A102540(2)*A102540(13) = 61 * 241.

Crossrefs

Cf. A001358, A109611, A102540.

Sequence in context: A236030 A237892 A326318 * A062670 A379455 A206468

Adjacent sequences: A115716 A115717 A115718 * A115720 A115721 A115722

Keyword

easy,nonn

Author

Jonathan Vos Post, Mar 09 2006

Status

approved