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A117084 Octagonal numbers for which both the sum and the product of the digits is also a octagonal number. 0
0, 1, 8, 1160, 20501, 30401, 42960, 90480, 131880, 168033, 181056, 208560, 238008, 269400, 302736, 338016, 375240, 414408, 455520, 520833, 590520, 690240, 743016, 770133, 854400, 913008, 943041, 1004565, 1036056, 1068033, 1100496, 1235208 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..31.

EXAMPLE

42960 is in the sequence because (1) it is a octagonal number, the sum of its digits 4+2+9+6+0=21 is an octagonal number and (3) the product of its digits 4*2*9*6*0= 0 is also a octagonal number.

CROSSREFS

Cf. A000567.

Sequence in context: A229164 A003767 A221084 * A201985 A301614 A180767

Adjacent sequences:  A117081 A117082 A117083 * A117085 A117086 A117087

KEYWORD

base,nonn

AUTHOR

Luc Stevens (lms022(AT)yahoo.com), Apr 17 2006

STATUS

approved

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Last modified April 13 10:24 EDT 2021. Contains 342935 sequences. (Running on oeis4.)