The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A112662 Cubes of the form semiprime(k) + k-th composite number. 3
 8, 27, 64, 216, 343, 1000, 24389, 27000, 35937, 42875, 46656, 68921, 74088, 97336, 148877, 226981, 373248, 405224, 456533, 551368, 681472, 970299, 1191016, 1771561, 1860867, 2048383, 2352637, 3112136, 3375000, 4019679, 4410944 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Corresponding k's: 1, 6, 15, 50, 78, 219, 4803, 5303, 6973, 8261, 8968, 13058, 13972, 18210, 27426, 41167, ..., . - Robert G. Wilson v, Dec 30 2005 The corresponding cube roots: 2, 3, 4, 6, 7, 10, 29, ..., . - Robert G. Wilson v, Dec 30 2005 LINKS Table of n, a(n) for n=1..31. MATHEMATICA Composite[n_Integer] := FixedPoint[n + PrimePi@# + 1 &, n + PrimePi@n + 1]; fQ[n_] := Plus @@ Last /@ FactorInteger@n == 2; c = 0; t = {}; Do[ If[fQ[n], c++; a = n + Composite[c]; If[ IntegerQ[a^(1/3)], AppendTo[t, a]]], {n, 10^7}] (* Robert G. Wilson v *) CROSSREFS Sequence in context: A076969 A179163 A050462 * A121652 A112989 A018832 Adjacent sequences: A112659 A112660 A112661 * A112663 A112664 A112665 KEYWORD nonn AUTHOR Giovanni Teofilatto, Dec 29 2005 EXTENSIONS More terms from Robert G. Wilson v, Dec 30 2005 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified May 30 04:46 EDT 2024. Contains 372958 sequences. (Running on oeis4.)