A128879 - OEIS

This site is supported by donations to The OEIS Foundation.

A128879

Primes of the form Sum[ (k(k+1)/2)^r, {k,1,s} ] for some integers r>0 and s>1.

62003, 380862171499238015813159, 477178536605483099069547874229030876125647161030458264473574997121391, 206419274016718024802773356759257053810224508067009725029122120681133886193 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`a(n) are the primes that equal the sum of the r-th powers of the first s triangular numbers. For first 5 listed terms the corresponding pairs of integers r and s are {r,s} = { {4,5}, {12,13}, {26,29}, {27,33}, {90,5} }. There are also known terms corresponding to {r,s} = { {35,285}, {144,5}, {141,37}, {179,13} } which are too large to include.`
	CROSSREFS	`Cf. A019434 = Fermat primes: primes of form 2^(2^n) + 1.` `Sequence in context: A204395 A181261 A112015 * A203258 A089009 A093791` `Adjacent sequences: A128876 A128877 A128878 * A128880 A128881 A128882`
	KEYWORD	`nonn`
	AUTHOR	`Alexander Adamchuk (alex(AT)kolmogorov.com), May 08 2007`

Content is available under The OEIS End-User License Agreement .

Last modified February 15 12:13 EST 2012. Contains 205783 sequences.