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A304480 a(n) is the least m such that lambda(k) >= n for all k >= m where lambda is A002322, the Carmichael lambda function. 3
1, 3, 25, 25, 241, 241, 505, 505, 505, 505, 505, 505, 65521, 65521, 65521, 65521, 65521, 65521, 65521, 65521, 65521, 65521, 65521, 65521, 131041, 131041, 131041, 131041, 131041, 131041, 171865, 171865, 171865, 171865, 171865, 171865, 138181681, 138181681, 138181681, 138181681, 138181681, 138181681 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Seiichi Manyama, Table of n, a(n) for n = 1..5000

Project Euler, Problem 533 - Minimum values of the Carmichael function

Wikipedia, Carmichael function

PROG

(PARI) minvl(n, v) = {vgt = select(x->(x>=n), v, 1); first = vgt[1]; vgtd = vector(#vgt-1, k, vgt[k+1] - vgt[k]); vgtdr = Vecrev(vgtd); vokdiff = select(x->x!=1, vgtdr, 1); if (#vokdiff, #v - vokdiff[1]+1, first); }

lista(nn) = {v = read("v002322.txt"); for (n=1, nn, print1(minvl(n, v), ", "); ); }

CROSSREFS

Cf. A002174, A002322, A002396, A141162, A143407, A335116, A335117.

Sequence in context: A085836 A073916 A076962 * A129599 A042899 A266702

Adjacent sequences:  A304477 A304478 A304479 * A304481 A304482 A304483

KEYWORD

nonn

AUTHOR

Michel Marcus, May 13 2018

EXTENSIONS

a(32) and beyond from Seiichi Manyama, May 24 2020

STATUS

approved

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Last modified May 16 01:55 EDT 2021. Contains 343937 sequences. (Running on oeis4.)