A343670 a(n) is the least semiprime congruent to 1 (mod n-th semiprime).

9, 25, 10, 21, 15, 46, 22, 111, 26, 183, 34, 35, 106, 39, 118, 93, 295, 205, 111, 58, 291, 187, 326, 346, 371, 155, 247, 86, 87, 262, 183, 94, 95, 381, 213, 334, 346, 119, 358, 122, 123, 247, 259, 134, 403, 142, 143, 287, 146, 731, 466, 159, 319, 323, 831, 339, 178, 535, 1099, 371, 562

Offset

1,1

Links

Table of n, a(n) for n=1..61.

Example

9 = 4*2+1, 25 = 6*4+1, 10 = 9*1+1.

Mathematica

sp = Select[Range[4, 10^3], 2 == PrimeOmega[#] &]; Table[n = sp[[k]]; a = n; While[2 != PrimeOmega[a + 1], a = a + n]; a + 1, {k, 100}]

Crossrefs

Cf. A001358, A108181, A112771.

Sequence in context: A096757 A101158 A113496 * A086531 A089091 A282176

Adjacent sequences: A343667 A343668 A343669 * A343671 A343672 A343673

Keyword

nonn

Author

Zak Seidov, May 09 2021

Status

approved