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A059321 Smallest number m such that m^2+1 is divisible by A002144(n)^2 (= squares of primes congruent to 1 mod 4). 9
7, 70, 38, 41, 117, 378, 500, 682, 776, 3861, 4052, 515, 5744, 1710, 6613, 1744, 11018, 13241, 3458, 5099, 1393, 16610, 26884, 15006, 2072, 13637, 31361, 4443, 26508, 7850, 37520, 31152, 39922, 37107, 6072, 4005, 32491, 4030, 43211, 12238 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(2) = 70 since A002144(2)=13, 70^2+1 = 4091 = 13^2 * 29 and for no k<70 does 13^2 divide k^2+1. Related to period-1 continued fractions.

LINKS

Klaus Brockhaus, Table of n, a(n) for n=1..2000

CROSSREFS

Cf. A002144, A059591, A059592.

Sequence in context: A226270 A121351 A302353 * A217400 A077683 A082797

Adjacent sequences:  A059318 A059319 A059320 * A059322 A059323 A059324

KEYWORD

easy,nonn

AUTHOR

Marc LeBrun, Jan 26 2001

STATUS

approved

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Last modified June 25 17:47 EDT 2019. Contains 324353 sequences. (Running on oeis4.)