A189554 Composite numbers n such that x' = n has no integer solution, where x' is the arithmetic derivative (A003415) of x.

35, 57, 65, 93, 117, 125, 145, 177, 189, 205, 207, 209, 217, 219, 237, 245, 261, 289, 303, 305, 323, 325, 345, 377, 387, 393, 413, 415, 427, 429, 453, 473, 477, 485, 497, 513, 515, 517, 529, 531, 533, 537, 553, 561, 597, 605, 625, 629, 639, 657, 665, 681

Offset

1,1

Comments

These are the composite terms of A098700. The prime terms of A098700 are in A189483. Apparently all terms are odd.

References

See A003415.

Links

T. D. Noe, Table of n, a(n) for n = 1..1000

Formula

Composite k such that A099302(k) = 0.

Crossrefs

Cf. A003415, A098700, A099302, A189483.

Sequence in context: A254366 A242291 A078819 * A351095 A267738 A219806

Adjacent sequences: A189551 A189552 A189553 * A189555 A189556 A189557

Keyword

nonn

Author

T. D. Noe, Apr 24 2011

Status

approved