A320862 Powers of 2 with initial digit 6.

64, 65536, 67108864, 68719476736, 604462909807314587353088, 618970019642690137449562112, 633825300114114700748351602688, 649037107316853453566312041152512, 664613997892457936451903530140172288, 680564733841876926926749214863536422912

Offset: 1

Author

Muniru A Asiru, Oct 23 2018

Keywords

• base
• nonn

Links

• Muniru A Asiru, Table of n, a(n) for n = 1..220
• Index to divisibility sequences

Crossrefs

Cf. A000079 (powers of 2), A008952 (leading digit of 2^n), A217399 (numbers starting with 6).

Powers of 2 with initial digit k, (k = 1..6): A067488, A067480, A320859, A320860, A320861, this sequence.

Programs

GAP

Filtered(List([0..180],n->2^n),i->ListOfDigits(i)[1]=6);

Magma

[2^n: n in [1..160] | Intseq(2^n)[#Intseq(2^n)] eq 6]; // G. C. Greubel, Oct 27 2018

Maple

select(x->"6"=""||x[1],[2^n$n=0..180])[];

Mathematica

Select[2^Range[160], First[IntegerDigits[#]] == 6 &] (* G. C. Greubel, Oct 27 2018 *)

PARI

select(x->(digits(x)[1]==6), vector(200, n, 2^n)) \\ Michel Marcus, Oct 26 2018