A276375 Numbers n such that A240024(n + 1) = A002808(n).

1, 2, 3, 11, 22, 29, 47, 49, 52, 67, 78, 79, 80, 91, 103, 104, 109, 111, 121, 130, 137, 148, 152, 159, 179, 184, 190, 200, 207, 215, 222, 241, 264, 278, 291, 307, 309, 316, 331, 336, 343, 347, 350, 361, 373, 380, 400, 409, 415, 430, 435, 445, 450, 453, 468

Offset

1,2

Links

Peter Kagey, Table of n, a(n) for n = 1..10000

Mathematica

c = Select[Range@ 600, CompositeQ]; a = {1, 4}; Do[k = 6; While[Or[PrimeQ@ k, MemberQ[a, k], CoprimeQ[a[[i - 1]], k]], k++]; AppendTo[a, k], {i, 3, Length@c + 1}]; Flatten@ Position[Union /@ Transpose@ {Rest@ a, c}, w_ /; Length@ w == 1] (* Michael De Vlieger, Sep 01 2016 *)

Prog

(Haskell)
a276375 n = a276375_list !! (n - 1)
a276375_list = filter (\i -> a240024 (i + 1) == a002808 i) [1..]

Crossrefs

Cf. A002808, A240024, A276374.

Sequence in context: A028816 A316187 A215952 * A128921 A118595 A229549

Adjacent sequences: A276372 A276373 A276374 * A276376 A276377 A276378

Keyword

nonn

Author

Peter Kagey, Aug 31 2016

Status

approved