A249595 Positions of nonprimes in A249054.

1, 3, 5, 6, 8, 9, 10, 13, 15, 16, 20, 21, 24, 25, 26, 28, 29, 31, 33, 35, 36, 39, 40, 43, 44, 46, 48, 49, 52, 56, 57, 59, 60, 62, 63, 66, 67, 69, 70, 73, 76, 77, 79, 82, 83, 85, 86, 88, 91, 92, 93, 95, 96, 98, 99, 101, 103, 104, 106, 107, 110, 112, 114, 115

Offset: 1

Author

Reinhard Zumkeller, Nov 03 2014

Keywords

• nonn

Comments

A249054(a(n)) = A018252(n); sequence is strictly increasing, i.e. all nonprimes occur in A249054 in natural order, see also A249594.

Links

• Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A018252, A026233, A049084, A239968, A249054, A249594 (complement).

Programs

Haskell

import Data.List (elemIndex); import Data.Maybe (fromJust)
a249595 = (+ 1) . fromJust . (`elemIndex` a249054_list) . a018252