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User: Lev Krasnovsky

Lev Krasnovsky has authored 2 sequences.

A244582 First 88 elements listed by melting point from lowest to highest.

2, 1, 10, 9, 8, 7, 18, 36, 54, 17, 86, 80, 35, 87, 55, 31, 37, 15, 19, 33, 11, 16, 53, 49, 3, 34, 50, 84, 83, 85, 81, 48, 82, 30, 52, 51, 12, 93, 94, 13, 88, 56, 38, 58, 63, 70, 102, 20, 99, 98, 57, 59, 32, 47, 97, 95, 60, 89, 79, 62, 29, 61, 92, 25, 4, 64, 96, 65, 14, 66, 28, 67, 27, 68, 39, 100, 26, 21, 69, 46, 91, 103, 71, 22, 90, 78, 40, 24, 23, 45, 72, 43, 44, 5, 77, 41, 42, 73, 76, 75, 74, 6

Offset: 1

Lev Krasnovsky, Nov 11 2014

nonn

These are the atomic numbers of the elements.

Lenntech, Chemical Elements listed by melting points

Remaining known terms from original website from David Consiglio, Jr., Nov 20 2014

A248422 Even integers concatenated with themselves.

Original entry on oeis.org

22, 44, 66, 88, 1010, 1212, 1414, 1616, 1818, 2020, 2222, 2424, 2626, 2828, 3030, 3232, 3434, 3636, 3838, 4040, 4242, 4444, 4646, 4848, 5050, 5252, 5454, 5656, 5858, 6060, 6262, 6464, 6666, 6868, 7070, 7272, 7474, 7676, 7878, 8080, 8282, 8484, 8686, 8888, 9090, 9292, 9494, 9696, 9898, 100100

Offset: 1

Lev Krasnovsky, Oct 06 2014

Bisection of A020338.

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

Cf. A020338.

[Seqint(Intseq(n) cat Intseq(n)): n in [2..100 by 2]]; // Vincenzo Librandi, Oct 21 2014

FromDigits[Flatten[IntegerDigits/@#]]&/@Partition[With[{c=2*Range[ 50]}, Riffle[c,c]],2] (* or *) Table[n*10^IntegerLength[n]+n,{n,2,100,2}] (* Harvey P. Dale, Jun 11 2019 *)

a(n) = eval(concat(Str(2*n), Str(2*n))); \\ Michel Marcus, Oct 06 2014

a(n) = 2*n*10^ceiling(log_10(2*n)) + 2*n. - Tom Edgar, Oct 21 2014

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User: Lev Krasnovsky

A244582 First 88 elements listed by melting point from lowest to highest.

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A248422 Even integers concatenated with themselves.

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