A048951 (2,4) Ulam sequence.

2, 4, 6, 8, 12, 16, 22, 26, 32, 36, 52, 56, 72, 76, 94, 96, 106, 114, 124, 138, 144, 154, 164, 174, 194, 198, 204, 212, 228, 252, 262, 276, 290, 296, 310, 350, 354, 360, 364, 378, 394, 412, 418, 438, 442, 472, 476, 482, 486, 506, 516, 520, 546, 564, 618, 632

Offset: 1

Author

Eric W. Weisstein

Keywords

• nonn

Comments

This sequence is 2*A002858, since in general U(k*m, k*n) = k * U(m, n), where U(m, n) is the (m, n)-Ulam sequence. - Enrique Navarrete, May 05 2017

Links

• Reinhard Zumkeller, Table of n, a(n) for n = 1..1000
• Eric Weisstein's World of Mathematics, Ulam Sequence
• Wikipedia, Ulam number
• Index entries for Ulam numbers

Crossrefs

Cf. A002858.

Programs

Haskell

a048951 n = a048951_list !! (n-1)
a048951_list = 2 : 4 : ulam 2 4 a048951_list
-- Function ulam as defined in A002858.
-- Reinhard Zumkeller, Nov 03 2011