id:A034939 - OEIS Search Results

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a(n) is smallest number such that a(n)^2 + 1 is divisible by 5^n.

+0
4

0, 2, 7, 57, 182, 1068, 1068, 32318, 110443, 280182, 3626068, 23157318, 120813568, 123327057, 1097376068, 11109655182, 49925501068, 355101282318, 355101282318, 3459595983307, 15613890344818, 110981321985443 (list; graph; listen)

	OFFSET	`0,2`
	PROGRAM	`(PARI) b(n)=if(n<2, 2, b(n-1)^5)%5^n; a(n)=min(b(n), 5^n-b(n))`
	CROSSREFS	`A034939(n)=min(A048898(n), A048899(n)). Cf. A034935.` `Sequence in context: A024027 A079410 A002658 this_sequence A048898 A034935 A121079` `Adjacent sequences: A034936 A034937 A034938 this_sequence A034940 A034941 A034942`
	KEYWORD	`nonn,nice,easy`
	AUTHOR	`njas`
	EXTENSIONS	`More terms from Michael Somos`

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Last modified July 25 02:12 EDT 2008. Contains 142294 sequences.

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