A116570 a(2*n) = prime(n+1) * prime(n+2), a(2*n-1) = prime(n+1).

6, 3, 15, 5, 35, 7, 77, 11, 143, 13, 221, 17, 323, 19, 437, 23, 667, 29, 899, 31, 1147, 37, 1517, 41, 1763, 43, 2021, 47, 2491, 53, 3127, 59, 3599, 61, 4087, 67, 4757, 71, 5183, 73, 5767, 79, 6557, 83, 7387, 89, 8633, 97, 9797, 101, 10403, 103, 11021, 107, 11663

Offset

0,1

Links

G. C. Greubel, Table of n, a(n) for n = 0..5000

Formula

a(2*n) = prime(n+1) * prime(n+2). a(2*n-1) = prime(n+1). - Michael Somos, Jul 20 2016

Crossrefs

Cf. A114557.

Sequence in context: A049784 A341746 A097917 * A335567 A362625 A352015

Adjacent sequences: A116567 A116568 A116569 * A116571 A116572 A116573

Keyword

nonn,less

Author

Roger L. Bagula, Mar 18 2006

Extensions

Edited, new name using Michael Somos' formula, Joerg Arndt, Sep 21 2017

Status

approved