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A130272 Primes p for which the period of the continued fraction of sqrt(p) increases. 3
2, 3, 7, 13, 19, 31, 43, 61, 103, 109, 139, 151, 181, 211, 331, 421, 541, 571, 631, 751, 919, 1291, 1381, 1549, 1579, 1621, 1759, 1831, 2011, 2311, 2671, 3019, 3469, 3691, 3931, 4909, 4951, 4999, 5119, 6211, 6451, 6679, 8269, 8719, 8779, 8941, 9739, 9949 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

T. D. Noe, Table of n, a(n) for n=1..200

FORMULA

Where records occur in A054269.

MATHEMATICA

mx=0; n=0; t=Table[n++; While[p=Prime[n]; len=Length[Last[ContinuedFraction[Sqrt[p]]]]; len<=mx, n++ ]; mx=len; p, {50}]

CROSSREFS

Cf. A003285, A013645.

Sequence in context: A045331 A053613 A013645 * A172238 A038940 A019383

Adjacent sequences:  A130269 A130270 A130271 * A130273 A130274 A130275

KEYWORD

nonn

AUTHOR

T. D. Noe, May 19 2007

STATUS

approved

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Last modified November 26 04:58 EST 2014. Contains 250017 sequences.