A083141 Main diagonal of array in A083140.

2, 9, 35, 91, 209, 377, 629, 817, 1219, 1769, 2201, 2923, 3649, 4343, 5029, 5989, 7729, 8479, 10117, 11573, 12629, 14299, 16019, 17711, 21631, 23129, 24617, 26857, 28667, 30623, 35687, 38383, 42607, 44063, 50213, 52699, 56363, 60799, 63961, 68681

Offset

1,1

Links

Table of n, a(n) for n=1..40.

Formula

a(n) = prime(n)*prime(2*n-2).

Mathematica

Table[ Prime[n]*Prime[2n - 2], {n, 2, 41}]

Prog

(PARI) vector(50, n, if (n==1, 2, prime(n)*prime(2*n-2))) \\ Michel Marcus, Dec 19 2014

Crossrefs

Cf. A083140.

Sequence in context: A200050 A032601 A255410 * A001571 A092431 A147762

Adjacent sequences: A083138 A083139 A083140 * A083142 A083143 A083144

Keyword

nonn

Author

Yasutoshi Kohmoto, Jun 05 2003

Extensions

Edited and extended by Robert G. Wilson v, Jun 11 2003

Status

approved