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A286382 Compound filter: a(n) = P(A257993(n), A278226(n)), where P(n,k) is sequence A000027 used as a pairing function. 2
2, 5, 16, 12, 67, 9, 16, 23, 436, 80, 1771, 18, 67, 80, 1771, 668, 16111, 48, 277, 302, 7141, 2630, 64621, 156, 1129, 1178, 28681, 10442, 258841, 14, 16, 23, 436, 80, 1771, 31, 436, 467, 21946, 1832, 87991, 94, 1771, 1832, 87991, 16292, 793171, 328, 7141, 7262, 352381, 64982, 3173941, 1228, 28681, 28922, 1410361, 259562, 12698281, 25, 67, 80, 1771, 668, 16111 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..11550

Eric Weisstein's World of Mathematics, Pairing Function

Index entries for sequences related to primorial base

FORMULA

a(n) = (1/2)*(2 + ((A257993(n)+A278226(n))^2) - A257993(n) - 3*A278226(n)).

PROG

(Scheme) (define (A286382 n) (* (/ 1 2) (+ (expt (+ (A257993 n) (A278226 n)) 2) (- (A257993 n)) (- (* 3 (A278226 n))) 2)))

CROSSREFS

Cf. A000027, A257993, A278226, A286142.

Differs from A286381 for the first time at n=24, where a(24) = 156 while A286381(24) = 14.

Sequence in context: A248125 A297473 A286381 * A127580 A098048 A257348

Adjacent sequences:  A286379 A286380 A286381 * A286383 A286384 A286385

KEYWORD

nonn

AUTHOR

Antti Karttunen, May 08 2017

STATUS

approved

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Last modified June 15 16:13 EDT 2019. Contains 324142 sequences. (Running on oeis4.)