A020767 Product_{k=1..n} b(k), where b(k) = binary expansion of k (A007088) but read as if it were a decimal number.

1, 1, 10, 110, 11000, 1111000, 122210000, 13565310000, 13565310000000, 13578875310000000, 13714664063100000000, 13865525367794100000000, 15252077904573510000000000, 16792537772935434510000000000, 18639716927958332306100000000000, 20708725506961707192077100000000000

Offset

0,3

Links

Paolo Xausa, Table of n, a(n) for n = 0..175

Example

a(4) = 1*10*11*100 = 11000.

Mathematica

FoldList[Times, 1, Map[FromDigits, IntegerString[Range[15], 2]]] (* Paolo Xausa, Sep 29 2025 *)

Crossrefs

Partial products of A007088.

Sequence in context: A305213 A181929 A339713 * A036603 A092500 A092501

Adjacent sequences: A020764 A020765 A020766 * A020768 A020769 A020770

Keyword

nonn,base,easy

Author

Susanna Cuyler, May 23 2003

Status

approved