A030134 - OEIS

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A030134

a(n)^2 has last digit equal to the sum of the other digits.

27, 33, 35, 55, 57, 123, 145, 147, 153, 177, 453, 1497, 3747, 3873, 4497, 4797, 10203, 10503, 31623, 1002003, 1005003, 100020003, 100050003, 10000200003, 10000500003, 1000002000003, 1000005000003, 100000020000003

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..28.

FORMULA

Sequence includes both 10^(2n) + 2*10^n + 3 and 10^(2n) + 5*10^n + 3 for n >= 2.

MATHEMATICA

Select[Range[10^6], First@ #1 == Total@ #2 & @@ TakeDrop[IntegerDigits[#^2], -1] &] (* Michael De Vlieger, Oct 06 2019 *)

CROSSREFS

Cf. A054259.

Sequence in context: A144862 A117934 A173136 * A290842 A024796 A025322

Adjacent sequences: A030131 A030132 A030133 * A030135 A030136 A030137

KEYWORD

base,nonn

AUTHOR

George Russell (george(AT)persimmon.com)

EXTENSIONS

More terms from Patrick De Geest, Feb 15 2000

More terms from Jon E. Schoenfield, Apr 03 2010

Offset changed by Andrew Howroyd, Aug 13 2024

STATUS

approved

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