A291672 Numbers k such that 4 is the smallest decimal digit of k^4.

26, 46, 822, 1594, 9296, 29426, 46278, 161954, 289146, 835718, 958646, 2743904, 2764968, 5446346, 8175708, 15381676, 30590282, 52240108, 149140628, 260414482, 284539894, 299068782, 471886024, 490673642, 508339942, 827983028, 863811282, 868389594, 911303358, 1486895644

Offset

1,1

Links

Giovanni Resta, Table of n, a(n) for n = 1..100 (first 62 terms from Chai Wah Wu)

Example

26 is in the sequence because 26^4 = 456976, the smallest decimal digit of which is 4.

Mathematica

Select[Range[10^6], Min[IntegerDigits[#^4]] == 4 &] (* Giovanni Resta, Aug 29 2017 *)

Prog

(PARI) select(k->vecmin(digits(k^4))==4, vector(1000000, k, k))
(Python)
A291672_list = [k for k in range(1, 10**6) if min(str(k**4)) == '4'] # Chai Wah Wu, Aug 29 2017

Crossrefs

Cf. A291668, A291669, A291670, A291671.

Sequence in context: A255988 A304673 A039458 * A159651 A118367 A316120

Adjacent sequences: A291669 A291670 A291671 * A291673 A291674 A291675

Keyword

nonn,base

Author

Colin Barker, Aug 29 2017

Extensions

a(16)-a(18) from Giovanni Resta, Aug 29 2017

a(19)-a(30) from Chai Wah Wu, Aug 29 2017

Status

approved