A092957 In the triangle 1 / 1*2 2*3 / 1*2*3 2*3*4 3*4*5 / ... if every number k is replaced by prime(k) one gets the following triangle 2 / 6 15 / 30 105 385 / 210 1155 5005 17017 / ... Sequence contains the row sums.

2, 21, 520, 23387, 1488080, 126969115, 14557233552, 1815049963645, 289937962615754, 52507954943028529, 9917857274310865368, 2089330987019155955571, 490521122195171102901196

Offset

1,1

Comments

The leading diagonal is given by A060381 and the first column by A002110.

Links

Table of n, a(n) for n=1..13.

Maple

a:=n->sum(product(ithprime(i+j-1), j=1..n), i=1..n): seq(a(n), n=1..16); # Emeric Deutsch, Jun 26 2005

Crossrefs

Cf. A092956.

Sequence in context: A238696 A226057 A158886 * A356481 A171107 A218768

Adjacent sequences: A092954 A092955 A092956 * A092958 A092959 A092960

Keyword

easy,nonn

Author

Amarnath Murthy, Mar 25 2004

Extensions

More terms from Emeric Deutsch, Jun 26 2005

Status

approved