PadLeft

PadLeft(list, n)

pads list to length n by adding 0 on the left.

PadLeft(list, n, x)

pads list to length n by adding x on the left.

PadLeft(list)

turns the ragged list list into a regular list by adding ‘0’ on the left.

Examples

>> PadLeft({1, 2, 3}, 5)
{0,0,1,2,3}

>> PadLeft(x(a, b, c), 5)
x(0,0,a,b,c)

>> PadLeft({1, 2, 3}, 2)
{2, 3}

>> PadLeft({{}, {1, 2}, {1, 2, 3}})
{{0,0,0},{0,1,2},{1,2,3}}

OEIS - A196023:

>> Select(Table(FromDigits@Join(Flatten@IntegerDigits@PadLeft({666}, 2, n), Reverse@IntegerDigits(n)), {n, 397}), PrimeQ)
{16661,76667,3166613,3466643,7466647,7666667,145666541,148666841,152666251,
155666551,169666961,176666671,181666181,304666403,305666503,307666703,308666803,
329666923,347666743,349666943,373666373,374666473,383666383,391666193,397666793}

Implementation status

• ✅ - full supported

Github

• Implementation of PadLeft