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A118623 a(0) = 1, a(n+1) = a(n)^2 + number of divisors of a(n). 0
1, 2, 6, 40, 1608, 2585680, 6685741062420, 44699133553728910336256592, 1998012540454093724746522398047564450017935663454544 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

a(n) = A000290(a(n-1)) + A000005(a(n-1).

LINKS

Table of n, a(n) for n=0..8.

Index entries for sequences of form a(n+1)=a(n)^2 + ...

CROSSREFS

Cf. A007018.

Sequence in context: A320489 A135755 A051185 * A000612 A319633 A326268

Adjacent sequences:  A118620 A118621 A118622 * A118624 A118625 A118626

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, May 09 2006

STATUS

approved

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Last modified May 28 04:54 EDT 2020. Contains 334671 sequences. (Running on oeis4.)