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A284890 a(1)=2, and then a(n+1) = a(n) + k where prime(k) is the least prime dividing a(n). 1
2, 3, 5, 8, 9, 11, 16, 17, 24, 25, 28, 29, 39, 41, 54, 55, 58, 59, 76, 77, 81, 83, 106, 107, 135, 137, 170, 171, 173, 213, 215, 218, 219, 221, 227, 276, 277, 336, 337, 405, 407, 412, 413, 417, 419, 500, 501, 503, 599, 708, 709, 836, 837, 839, 985, 988, 989 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Rémy Sigrist, Table of n, a(n) for n = 1..2297

Rémy Sigrist, C program for A284890

FORMULA

a(n+1) = a(n) + A055396(a(n)) for any n>1.

EXAMPLE

a(9) = 24 = prime(1)^3*prime(2), hence a(10) = 24+1 = 25.

a(14) = 41 = prime(13), hence a(15) = 41+13 = 54.

CROSSREFS

Cf. A055396, A076271.

Sequence in context: A285253 A047254 A226815 * A051214 A256722 A192391

Adjacent sequences:  A284887 A284888 A284889 * A284891 A284892 A284893

KEYWORD

nonn

AUTHOR

Rémy Sigrist, Apr 05 2017

STATUS

approved

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Last modified January 22 23:50 EST 2022. Contains 350504 sequences. (Running on oeis4.)