OFFSET

1,1

COMMENTS

The subsequence of primes begins: 2, 1381, 1519133281 [Jonathan Vos Post, Feb 01 2011].

LINKS

Kenneth Korbin, Problem 665, The College Mathematics Journal Vol. 30 No. 5, Nov. 1999. Asks for the 48th number in this sequence.

EXAMPLE

The order of the terms is ignored when deciding in how many ways the sum can be expressed. For example, a(2) does not equal 9, although 9 = 3 + 6 = 6 + 3.

a(2) = 16 because 16 = 1 + 15 = 6 + 10. a(3) = 81 because 81 = 3 + 78 = 15 + 66 = 36 + 55.

CROSSREFS

KEYWORD

nonn,nice,easy

AUTHOR

Jeremy Rouse, Jan 19 2000

EXTENSIONS

More terms from Christian G. Bower, Jan 23 2000

a(25)-a(26) from Donovan Johnson, Jun 26 2010

a(27)-a(28) from Donovan Johnson, Mar 20 2013

STATUS

approved