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A277854 Frequent terms, i.e., values such that no smaller value appears more often, in A075771 = quotient + remainder of Euclidean division of n^2 by prime(n). 3
1, 2, 4, 5, 9, 15, 16, 48, 64, 86, 100, 144, 169, 3364, 3969, 4096, 195364 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Equivalently, record values (in the weak sense of >=) in the sequence of frequencies of values of A075771. (The lower bound A075771(n) >= n^2/prime(n) ensures that no number below this limit can occur beyond the index n in that sequence.)

It appears that this sequence contains mainly squares, but there are exceptions such as 2, 5, 15, 48, 86, and some squares (25 = 5^2, 36 = 6^2, 49 = 7^2, 81 = 9^2, 121 = 11^2) do not occur. Is there an explanation for this and/or the fact that exceptions are close to missing squares: 48 ~ 49 = 7^2, 86 ~ 81 = 9^2 ? Can one prove or disprove that

- from some point on, only squares will occur?

- all sufficiently large squares (or: even squares?) will occur?

- from a(12) = 144 (or some later point) on, a(n) will occur in A075771 strictly more often than the preceding value?

a(18) > 10^6. - Robert G. Wilson v, Nov 25 2016

LINKS

Table of n, a(n) for n=1..17.

EXAMPLE

Values that occur in A075771 not less often than any smaller value are 1, 2, 4 (which appear once), 5, 9, 15 (which appear twice), 16, 48, 64, 86, 100 (which appear three times), 144 (which appears five times), 169 (which appears seven times), ...

CROSSREFS

Cf. A075771, A277851, A277852, A277853.

Sequence in context: A120939 A213290 A277852 * A120770 A266990 A255213

Adjacent sequences:  A277851 A277852 A277853 * A277855 A277856 A277857

KEYWORD

nonn,more

AUTHOR

M. F. Hasler, Nov 25 2016

EXTENSIONS

a(14)-a(17) from Robert G. Wilson v, Nov 25 2016

STATUS

approved

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Last modified October 14 07:06 EDT 2019. Contains 327995 sequences. (Running on oeis4.)