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A130596 Partial sums of skinny numbers (A061909). 1
1, 3, 6, 16, 27, 39, 52, 72, 93, 115, 145, 176, 276, 377, 479, 582, 692, 803, 915, 1028, 1148, 1269, 1391, 1521, 1721, 1922, 2124, 2334, 2545, 2757, 2977, 3198, 3498, 3799, 4109, 4420, 5420, 6421, 7423, 8426, 9436, 10447, 11459, 12472, 13492, 14513, 15535 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

The skinny partial sums of skinny numbers begin: a(1) = 1, a(2) = 3. The primes in the sequence begin: a(2) = 3, a(15) = 479, a(15) = 1721, a(38) = 6421, a(52) = 20899. The perfect powers in the sequence begin a(4) = 16 = 2^4, a(5) = 27 = 3^3, a(24) = 1521 = 39^2.

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000

EXAMPLE

a(36) = 4420 = 1+2+3+10+11+12+13+20+21+22+30+31+100+101+102+103+110+111+112+113+120+121+122+130+200+201+202+210+211+212+220+221+300+301+310+311

MATHEMATICA

Accumulate[Select[Range[0, 1200], IntegerReverse[#^2]==IntegerReverse[#]^2&]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Aug 02 2017 *)

CROSSREFS

Sequence in context: A212977 A127935 A144538 * A280730 A321409 A151954

Adjacent sequences:  A130593 A130594 A130595 * A130597 A130598 A130599

KEYWORD

base,easy,nonn

AUTHOR

Jonathan Vos Post, Jun 17 2007

STATUS

approved

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Last modified January 20 09:04 EST 2021. Contains 340302 sequences. (Running on oeis4.)