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A138838
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Concatenation of initial and final digits of n-th even superperfect number A061652(n), divided by 2.
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1
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11, 22, 8, 32, 23, 33, 12, 7, 8, 18, 42, 42
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Also, concatenation of initial and final digits of n-th superperfect number A019279(n), divided by 2, if there are no odd superperfect numbers.
Also, concatenation of A138124(n) and A138125(n), divided by 2.
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EXAMPLE
| a(5)=23 because the 5th even superperfect number A061652(5) is 4096 and the concatenation of initial and final digits of 4096 is 46 and 46/2 = 23.
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CROSSREFS
| Cf. A019279, A061652, A073729, A138124, A138125, A138842.
Sequence in context: A202627 A169853 A064263 * A139337 A040110 A140452
Adjacent sequences: A138835 A138836 A138837 * A138839 A138840 A138841
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KEYWORD
| base,easy,nonn
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AUTHOR
| Omar E. Pol (info(AT)polprimos.com), Apr 02 2008
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