1,2

a(12) > 10^26. - Donovan Johnson, Sep 27 2011

Table of n, a(n) for n=1..11.

Terry Trotter, Polygonal numbers [Warning: As of March 2018 this site appears to have been hacked. Proceed with great caution. The original content should be retrieved from the Wayback machine and added here. - N. J. A. Sloane, Mar 29 2018]

a(n) = A069173(A196494(n)).

Sequence in context: A084304 A228377 A178565 * A181321 A267770 A209597

Adjacent sequences: A195899 A195900 A195901 * A195903 A195904 A195905

nonn,base

Kausthub Gudipati, Sep 25 2011

a(8)-a(10) from Giovanni Resta, Sep 26 2011

a(11) from Donovan Johnson, Sep 27 2011

approved