A278259 - OEIS

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A278259

Least number with the prime signature of the n-th quarter-square, a(1) = 0.

5

0, 1, 2, 4, 6, 4, 12, 16, 12, 4, 30, 36, 30, 4, 24, 64, 72, 16, 60, 36, 30, 4, 60, 144, 60, 4, 30, 36, 210, 36, 240, 256, 48, 4, 60, 144, 60, 4, 60, 144, 420, 36, 210, 36, 30, 4, 120, 576, 360, 16, 60, 36, 120, 64, 360, 144, 60, 4, 210, 900, 210, 4, 96, 1024, 480, 36, 210, 36, 210, 36, 1260, 1296, 180, 4, 30, 36, 210, 36, 840, 576, 120, 4, 210, 900, 210, 4, 60

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,3

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..10000

FORMULA

a(1) = 0; for n > 1, a(n) = A046523(A002620(n)).

PROG

(Scheme) (define (A278259 n) (if (<= n 1) 0 (A046523 (A002620 n))))

CROSSREFS

Cf. A002620, A046523.

Cf. A278254, A278256 (bisections).

Cf. also A278260.

Sequence in context: A151886 A334016 A371241 * A293473 A353512 A257080

Adjacent sequences: A278256 A278257 A278258 * A278260 A278261 A278262

KEYWORD

nonn

AUTHOR

Antti Karttunen, Nov 22 2016

STATUS

approved