A100467 Semiprimes of special form: sum of a semiprime k and the k-th semiprime.

14, 21, 34, 129, 141, 158, 187, 194, 206, 221, 361, 382, 391, 393, 674, 893, 922, 934, 1067, 1094, 1133, 1293, 1415, 1441, 1473, 1569, 1589, 1681, 1703, 1739, 1769, 1982, 2119, 2206, 2362, 2395, 2433, 2481, 2507, 2602, 2614, 2627, 2642, 2823, 2839, 2983

Offset

1,1

Links

Table of n, a(n) for n=1..46.

Eric Weisstein, World of Mathematics, Semiprime.

Example

34 is in the sequence because both 9 and 9+semiprime(9) = 9+25 = 34 are semiprimes.

Crossrefs

Cf. A001358, A100493, A100466, A100915, A100916.

Sequence in context: A253810 A084995 A100466 * A082802 A258217 A272470

Adjacent sequences: A100464 A100465 A100466 * A100468 A100469 A100470

Keyword

easy,nonn

Author

Jonathan Vos Post, Nov 20 2004

Extensions

Edited, corrected and extended by Ray Chandler, Nov 26 2004

Status

approved