A302038 Semiludic numbers or "Ludic semiprimes": numbers n for which A302037(n) = 2.

4, 6, 9, 10, 14, 15, 19, 22, 26, 27, 31, 34, 35, 39, 46, 50, 55, 58, 59, 63, 65, 73, 74, 75, 82, 86, 94, 95, 99, 101, 103, 106, 113, 122, 133, 134, 135, 142, 145, 147, 154, 155, 163, 166, 167, 171, 178, 182, 185, 187, 194, 203, 205, 214, 219, 230, 238, 242, 243, 245, 253, 254, 255, 262, 263, 269, 271, 279, 286, 293, 298, 299, 311

Offset

1,1

Comments

An analog for A001358 based on the Ludic factorization (see A302032).

Links

Antti Karttunen, Table of n, a(n) for n = 1..3953

Index entries for sequences generated by sieves

Prog

(PARI) k=0; for(n=1, 512, if(2==A302037(n), k++; print1(n, ", "))); \\ Other code as in A302037.

Crossrefs

Cf. A003309, A255127, A302032, A302037.

Cf. A254100 (a subsequence).

Cf. also A001358, A302036.

Sequence in context: A085155 A371555 A219786 * A063762 A320912 A359765

Adjacent sequences: A302035 A302036 A302037 * A302039 A302040 A302041

Keyword

nonn

Author

Antti Karttunen, Apr 01 2018

Status

approved