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A076561 a(1)=2; a(n>1)= greatest prime divisor of a(n-1) + n. 1
2, 2, 5, 3, 2, 2, 3, 11, 5, 5, 2, 7, 5, 19, 17, 11, 7, 5, 3, 23, 11, 11, 17, 41, 11, 37, 2, 5, 17, 47, 13, 5, 19, 53, 11, 47, 7, 5, 11, 17, 29, 71, 19, 7, 13, 59, 53, 101, 5, 11, 31, 83, 17, 71, 7, 7, 2, 5, 2, 31, 23, 17, 5, 23, 11, 11, 13, 3, 3, 73, 3, 5, 13, 29, 13, 89, 83, 23, 17 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..79.

PROG

(PARI) lista(nn) = {v = vector(nn); v[1] = 2; for (n=2, nn, f = factor(v[n-1]+n); v[n] = f[#f~, 1]; ); v; } \\ Michel Marcus, Aug 08 2014

CROSSREFS

Cf. A076560 (a(1)=1).

Sequence in context: A097611 A135376 A132850 * A132851 A293833 A146316

Adjacent sequences:  A076558 A076559 A076560 * A076562 A076563 A076564

KEYWORD

easy,nonn

AUTHOR

Zak Seidov, Oct 19 2002

STATUS

approved

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Last modified April 7 04:20 EDT 2020. Contains 333292 sequences. (Running on oeis4.)