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 A060859 Powerful numbers of form n^2 - 1 such that n^2 is also powerful. 5
 8, 288, 675, 9800, 235224, 332928, 1825200, 11309768, 384199200, 592192224, 4931691075, 13051463048, 221322261600, 443365544448, 865363202000, 8192480787000, 13325427460800, 15061377048200, 511643454094368 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Donovan Johnson, Table of n, a(n) for n = 1..30 (terms < 10^22) FORMULA a(n)=x^2-1 and a(n)+1=x^2 are consecutive powerful numbers. EXAMPLE Factors of the first [ = x^2-1] terms of powerful pairs: 1825200 = 2.2.2.2.3.3.3.5.5.13.13; 11309768 = 2.2.2.29.29.41.41; 592192224 = 2.2.2.2.2.3.3.13.13.23.23.23; 4931691075 = 3.3.3.3.3.5.5.17.17.53.53. The 2nd terms are squares. CROSSREFS Proper subset of A060355. Cf. A001694, A060860. Sequence in context: A089670 A221612 A060355 * A187289 A187191 A054607 Adjacent sequences:  A060856 A060857 A060858 * A060860 A060861 A060862 KEYWORD nonn AUTHOR Labos E. (labos(AT)ana.sote.hu), May 04 2001 EXTENSIONS Corrected and extended by Jud McCranie, Jul 08 2001 Offset corrected by Donovan Johnson, Nov 15 2011 STATUS approved

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